EarthTrends (http://earthtrends.wri.org) Searchable Database Results
Provided by the World Resources Institute (http://www.wri.org)
"Environmental Governance and Institutions -- Corruption: Corruption perceptions index (Transparency International)"

"Units: index units, 10=least corrupt, 0=most corrupt"

,,2006,2005,2004,2003,2002,2001,2000,1999,1998,1997,1996,1988-1992,1980-1985,
Country
"Afghanistan","AFG",..,2.5,..,..,..,..,..,..,..,..,..,..,..,
"Albania","ALB",2.6,2.4,2.5,2.5,2.5,..,..,2.3,..,..,..,..,..,
"Algeria","DZA",3.1,2.8,2.7,2.6,..,..,..,..,..,..,..,..,..,
"Angola","AGO",2.2,2.0,2.0,1.8,1.7,..,1.7,..,..,..,..,..,..,
"Argentina","ARG",2.9,2.8,2.5,2.5,2.8,3.5,3.5,3.0,3.0,2.8,3.4,5.9,4.9,
"Armenia","ARM",2.9,2.9,3.1,3.0,..,..,2.5,2.5,..,..,..,..,..,
"Australia","AUS",8.7,8.8,8.8,8.8,8.6,8.5,8.3,8.7,8.7,8.9,8.6,8.2,8.4,
"Austria","AUT",8.6,8.7,8.4,8.0,7.8,7.8,7.7,7.6,7.5,7.6,7.6,7.1,7.4,
"Azerbaijan","AZE",2.4,2.2,1.9,1.8,2.0,2.0,1.5,1.7,..,..,..,..,..,
"Bahrain","BHR",5.7,5.8,5.8,6.1,..,..,..,..,..,..,..,..,..,
"Bangladesh","BGD",2.0,1.7,1.5,1.3,1.2,0.4,..,..,..,..,2.3,0.0,0.8,
"Barbados","BRB",6.7,6.9,7.3,..,..,..,..,..,..,..,..,..,..,
"Belarus","BLR",2.1,2.6,3.3,4.2,4.8,..,4.1,3.4,3.9,..,..,..,..,
"Belgium","BEL",7.3,7.4,7.5,7.6,7.1,6.6,6.1,5.3,5.4,5.3,6.8,7.4,8.3,
"Belize","BLZ",3.5,3.7,3.8,4.5,..,..,..,..,..,..,..,..,..,
"Benin","BEN",2.5,2.9,3.2,..,..,..,..,..,..,..,..,..,..,
"Bhutan","BTN",6.0,..,..,..,..,..,..,..,..,..,..,..,..,
"Bolivia","BOL",2.7,2.5,2.2,2.3,2.2,2.0,2.7,2.5,2.8,2.1,3.4,1.3,0.7,
"Bosnia and Herzegovina","BIH",2.9,2.9,3.1,3.3,..,..,..,..,..,..,..,..,..,
"Botswana","BWA",5.6,5.9,6.0,5.7,6.4,6.0,6.0,6.1,6.1,..,..,..,..,
"Brazil","BRA",3.3,3.7,3.9,3.9,4.0,4.0,3.9,4.1,4.0,3.6,3.0,3.5,4.7,
"Bulgaria","BGR",4.0,4.0,4.1,3.9,4.0,3.9,3.5,3.3,2.9,..,..,..,..,
"Burkina Faso","BFA",3.2,3.4,..,..,..,..,3.0,..,..,..,..,..,..,
"Burundi","BDI",2.4,2.3,..,..,..,..,..,..,..,..,..,..,..,
"Cambodia","KHM",2.1,2.3,..,..,..,..,..,..,..,..,..,..,..,
"Cameroon","CMR",2.3,2.2,2.1,1.8,2.2,2.0,2.0,1.5,1.4,..,2.5,3.4,4.6,
"Canada","CAN",8.5,8.4,8.5,8.7,9.0,8.9,9.2,9.2,9.2,9.1,9.0,9.0,8.4,
"Côte d'Ivoire","CIV",2.1,1.9,2.0,2.1,2.7,2.4,2.7,2.6,3.1,..,..,..,..,
"Central African Rep","CAF",2.4,..,..,..,..,..,..,..,..,..,..,..,..,
"Chad","TCD",2.0,1.7,1.7,..,..,..,..,..,..,..,..,..,..,
"Chile","CHL",7.3,7.3,7.4,7.4,7.5,7.5,7.4,6.9,6.8,6.1,6.8,5.5,6.5,
"China","CHN",3.3,3.2,3.4,3.4,3.5,3.5,3.1,3.4,3.5,2.9,2.4,4.7,5.1,
"Colombia","COL",3.9,4.0,3.8,3.7,3.6,3.8,3.2,2.9,2.2,2.2,2.7,2.7,3.3,
"Congo","COG",2.2,2.3,2.3,2.2,..,..,..,..,..,..,..,..,..,
"Congo, Dem Rep","COD",2.0,2.1,2.0,..,..,..,..,..,..,..,..,..,..,
"Costa Rica","CRI",4.1,4.2,4.9,4.3,4.5,4.5,5.4,5.1,5.6,6.5,..,..,..,
"Croatia","HRV",3.4,3.4,3.5,3.7,3.8,3.9,3.7,2.7,..,..,..,..,..,
"Cuba","CUB",3.5,3.8,3.7,4.6,..,..,..,..,..,..,..,..,..,
"Cyprus","CYP",5.6,5.7,5.4,6.1,..,..,..,..,..,..,..,..,..,
"Czech Rep","CZE",4.8,4.3,4.2,3.9,3.7,3.9,4.3,4.6,4.8,5.2,5.4,5.2,5.1,
"Denmark","DNK",9.5,9.5,9.5,9.5,9.5,9.5,9.8,10.0,10.0,9.9,9.3,8.9,8.0,
"Dominican Rep","DOM",2.8,3.0,2.9,3.3,3.5,3.1,..,..,..,..,..,..,..,
"Ecuador","ECU",2.3,2.5,2.4,2.2,2.2,2.3,2.6,2.4,2.3,..,3.2,3.3,4.5,
"Egypt","EGY",3.3,3.4,3.2,3.3,3.4,3.6,3.1,3.3,2.9,..,2.8,1.8,1.1,
"El Salvador","SLV",4.0,4.2,4.2,3.7,3.4,3.6,4.1,3.9,3.6,..,..,..,..,
"Equatorial Guinea","GNQ",2.1,1.9,..,..,..,..,..,..,..,..,..,..,..,
"Eritrea","ERI",2.9,2.6,2.6,..,..,..,..,..,..,..,..,..,..,
"Estonia","EST",6.7,6.4,6.0,5.5,5.6,5.6,5.7,5.7,5.7,..,..,..,..,
"Ethiopia","ETH",2.4,2.2,2.3,2.5,3.5,..,3.2,..,..,..,..,..,..,
"Fiji","FJI",..,4.0,..,..,..,..,..,..,..,..,..,..,..,
"Finland","FIN",9.6,9.6,9.7,9.7,9.7,9.9,10.0,9.8,9.6,9.5,9.1,8.9,8.1,
"France","FRA",7.4,7.5,7.1,6.9,6.3,6.7,6.7,6.6,6.7,6.7,7.0,7.5,8.4,
"Gabon","GAB",3.0,2.9,3.3,..,..,..,..,..,..,..,..,..,..,
"Gambia","GMB",2.5,2.7,2.8,2.5,..,..,..,..,..,..,..,..,..,
"Georgia","GEO",2.8,2.3,2.0,1.8,2.4,..,..,2.3,..,..,..,..,..,
"Germany","DEU",8.0,8.2,8.2,7.7,7.3,7.4,7.6,8.0,7.9,8.2,8.3,8.1,8.1,
"Ghana","GHA",3.3,3.5,3.6,3.3,3.9,3.4,3.5,3.3,3.3,..,..,..,..,
"Greece","GRC",4.4,4.3,4.3,4.3,4.2,4.2,4.9,4.9,4.9,5.4,5.0,5.1,4.2,
"Grenada","GRD",3.5,..,..,..,..,..,..,..,..,..,..,..,..,
"Guatemala","GTM",2.6,2.5,2.2,2.4,2.5,2.9,..,3.2,3.1,..,..,..,..,
"Guinea","GIN",1.9,..,..,..,..,..,..,..,..,..,..,..,..,
"Guyana","GUY",2.5,2.5,..,..,..,..,..,..,..,..,..,..,..,
"Haiti","HTI",1.8,1.8,1.5,1.5,2.2,..,..,..,..,..,..,..,..,
"Honduras","HND",2.5,2.6,2.3,2.3,2.7,2.7,..,1.8,1.7,..,..,..,..,
"Hong Kong","HKG",8.3,8.3,8.0,8.0,8.2,7.9,7.7,7.7,7.8,7.3,7.0,6.9,7.4,
"Hungary","HUN",5.2,5.0,4.8,4.8,4.9,5.3,5.2,5.2,5.0,5.2,4.9,5.2,1.6,
"Iceland","ISL",9.6,9.7,9.5,9.6,9.4,9.2,9.1,9.2,9.3,..,..,..,..,
"India","IND",3.3,2.9,2.8,2.8,2.7,2.7,2.8,2.9,2.9,2.8,2.6,2.9,3.7,
"Indonesia","IDN",2.4,2.2,2.0,1.9,1.9,1.9,1.7,1.7,2.0,2.7,2.7,0.6,0.2,
"Iran, Islamic Rep","IRN",2.7,2.9,2.9,3.0,..,..,..,..,..,..,..,..,..,
"Iraq","IRQ",1.9,2.2,2.1,2.2,..,..,..,..,..,..,..,..,..,
"Ireland","IRL",7.4,7.4,7.5,7.5,6.9,7.5,7.2,7.7,8.2,8.3,8.5,7.7,8.3,
"Israel","ISR",5.9,6.3,6.4,7.0,7.3,7.6,6.6,6.8,7.1,8.0,7.7,7.4,7.3,
"Italy","ITA",4.9,5.0,4.8,5.3,5.2,5.5,4.6,4.7,4.6,5.0,3.4,4.3,4.9,
"Jamaica","JAM",3.7,3.6,3.3,3.8,4.0,..,..,3.8,3.8,..,..,..,..,
"Japan","JPN",7.6,7.3,6.9,7.0,7.1,7.1,6.4,6.0,5.8,6.6,7.1,7.3,7.8,
"Jordan","JOR",5.3,5.7,5.3,4.6,4.5,4.9,4.6,4.4,4.7,..,4.9,5.5,5.3,
"Kazakhstan","KAZ",2.6,2.6,2.2,2.4,2.3,2.7,3.0,2.3,..,..,..,..,..,
"Kenya","KEN",2.2,2.1,2.1,1.9,1.9,2.0,2.1,2.0,2.5,..,2.2,1.6,3.3,
"Korea, Rep","KOR",5.1,5.0,4.5,4.3,4.5,4.2,4.0,3.8,4.2,4.3,5.0,3.5,3.9,
"Kuwait","KWT",4.8,4.7,4.6,5.3,..,..,..,..,..,..,..,..,..,
"Kyrgyzstan","KGZ",2.2,2.3,2.2,2.1,..,..,..,2.2,..,..,..,..,..,
"Lao People's Dem Rep","LAO",2.6,3.3,..,..,..,..,..,..,..,..,..,..,..,
"Latvia","LVA",4.7,4.2,4.0,3.8,3.7,3.4,3.4,3.4,2.7,..,..,..,..,
"Lebanon","LBN",3.6,3.1,2.7,3.0,..,..,..,..,..,..,..,..,..,
"Lesotho","LSO",3.2,3.4,..,..,..,..,..,..,..,..,..,..,..,
"Liberia","LBR",..,2.2,..,..,..,..,..,..,..,..,..,..,..,
"Libyan Arab Jamahiriya","LBY",2.7,2.5,2.5,2.1,..,..,..,..,..,..,..,..,..,
"Lithuania","LTU",4.8,4.8,4.6,4.7,4.8,4.8,4.1,3.8,..,..,..,..,..,
"Luxembourg","LUX",8.6,8.5,8.4,8.7,9.0,8.7,8.6,8.8,8.7,8.6,..,..,..,
"Macau","MAC",6.6,..,..,..,..,..,..,..,..,..,..,..,..,
"Macedonia, FYR","MKD",2.7,2.7,2.7,2.3,..,..,..,3.3,..,..,..,..,..,
"Madagascar","MDG",3.1,2.8,3.1,2.6,1.7,..,..,..,..,..,..,..,..,
"Malawi","MWI",2.7,2.8,2.8,2.8,2.9,3.2,4.1,4.1,4.1,..,..,..,..,
"Malaysia","MYS",5.0,5.1,5.0,5.2,4.9,5.0,4.8,5.1,5.3,5.0,5.3,5.1,6.3,
"Mali","MLI",2.8,2.9,3.2,3.0,..,..,..,..,..,..,..,..,..,
"Malta","MLT",6.4,6.6,6.8,..,..,..,..,..,..,..,..,..,..,
"Mauritania","MRT",3.1,..,..,..,..,..,..,..,..,..,..,..,..,
"Mauritius","MUS",5.1,4.2,4.1,4.4,4.5,4.5,4.7,4.9,5.0,..,..,..,..,
"Mexico","MEX",3.3,3.5,3.6,3.6,3.6,3.7,3.3,3.4,3.3,2.7,3.3,2.2,1.9,
"Moldova, Rep","MDA",3.2,2.9,2.3,2.4,2.1,3.1,2.6,2.6,..,..,..,..,..,
"Mongolia","MNG",2.8,3.0,3.0,..,..,..,..,4.3,..,..,..,..,..,
"Morocco","MAR",3.2,3.2,3.2,3.3,3.7,..,4.7,4.1,3.7,..,..,..,..,
"Mozambique","MOZ",2.8,2.8,2.8,2.7,..,..,2.2,3.5,..,..,..,..,..,
"Myanmar","MMR",1.9,1.8,1.7,1.6,..,..,..,..,..,..,..,..,..,
"Namibia","NAM",4.1,4.3,4.1,4.7,5.7,5.4,5.4,5.3,5.3,..,..,..,..,
"Nepal","NPL",2.5,2.5,2.8,..,..,..,..,..,..,..,..,..,..,
"Netherlands","NLD",8.7,8.6,8.7,8.9,9.0,8.8,8.9,9.0,9.0,9.0,8.7,9.0,8.4,
"New Zealand","NZL",9.6,9.6,9.6,9.5,9.5,9.4,9.4,9.4,9.4,9.2,9.4,9.3,8.4,
"Nicaragua","NIC",2.6,2.6,2.7,2.6,2.5,2.4,..,3.1,3.0,..,..,..,..,
"Niger","NER",2.3,2.4,2.2,..,..,..,..,..,..,..,..,..,..,
"Nigeria","NGA",2.2,1.9,1.6,1.4,1.6,1.0,1.2,1.6,1.9,1.8,0.7,0.6,1.0,
"Norway","NOR",8.8,8.9,8.9,8.8,8.5,8.6,9.1,8.9,9.0,8.9,8.9,8.7,8.4,
"Oman","OMN",5.4,6.3,6.1,6.3,..,..,..,..,..,..,..,..,..,
"Pakistan","PAK",2.2,2.1,2.1,2.5,2.6,2.3,..,2.2,2.7,2.5,1.0,1.9,1.5,
"Palestinian Territories","",..,2.6,2.5,3.0,..,..,..,..,..,..,..,..,..,
"Panama","PAN",3.1,3.5,3.7,3.4,3.0,3.7,..,..,..,..,..,..,..,
"Papua New Guinea","PNG",2.4,2.3,2.6,2.1,..,..,..,..,..,..,..,..,..,
"Paraguay","PRY",2.6,2.1,1.9,1.6,1.7,..,..,2.0,1.5,..,..,..,..,
"Peru","PER",3.3,3.5,3.5,3.7,4.0,4.1,4.4,4.5,4.5,..,..,..,..,
"Philippines","PHL",2.5,2.5,2.6,2.5,2.6,2.9,2.8,3.6,3.3,3.1,2.7,2.0,1.0,
"Poland","POL",3.7,3.4,3.5,3.6,4.0,4.1,4.1,4.2,4.6,5.1,5.6,5.2,3.6,
"Portugal","PRT",6.6,6.5,6.3,6.6,6.3,6.3,6.4,6.7,6.5,7.0,6.5,5.5,4.5,
"Qatar","QAT",6.0,5.9,5.2,5.6,..,..,..,..,..,..,..,..,..,
"Romania","ROU",3.1,3.0,2.9,2.8,2.6,2.8,2.9,3.3,3.0,3.4,..,..,..,
"Russian Federation","RUS",2.5,2.4,2.8,2.7,2.7,2.3,2.1,2.4,2.4,2.3,2.6,3.3,5.1,
"Rwanda","RWA",2.5,3.1,..,..,..,..,..,..,..,..,..,..,..,
"Saudi Arabia","SAU",3.3,3.4,3.4,4.5,..,..,..,..,..,..,..,..,..,
"Senegal","SEN",3.3,3.2,3.0,3.2,3.1,2.9,3.5,3.4,3.3,..,..,..,..,
"Serbia and Montenegro","YUG",3.0,2.8,2.7,2.3,..,..,1.3,2.0,3.0,..,..,..,..,
"Seychelles","SYC",3.6,4.0,4.4,..,..,..,..,..,..,..,..,..,..,
"Sierra Leone","SLE",2.2,2.4,2.3,2.2,..,..,..,..,..,..,..,..,..,
"Singapore","SGP",9.4,9.4,9.3,9.4,9.3,9.2,9.1,9.1,9.1,8.7,8.8,9.2,8.4,
"Slovakia","SVK",4.7,4.3,4.0,3.7,3.7,3.7,3.5,3.7,3.9,..,..,..,..,
"Slovenia","SVN",6.4,6.1,6.0,5.9,6.0,5.2,5.5,6.0,..,..,..,..,..,
"Somalia","SOM",..,2.1,..,..,..,..,..,..,..,..,..,..,..,
"South Africa","ZAF",4.6,4.5,4.6,4.4,4.8,4.8,5.0,5.0,5.2,5.0,5.7,7.0,7.4,
"Spain","ESP",6.8,7.0,7.1,6.9,7.1,7.0,7.0,6.6,6.1,5.9,4.3,5.1,6.8,
"Sri Lanka","LKA",3.1,3.2,3.5,3.4,3.7,..,..,..,..,..,..,..,..,
"Sudan","SDN",2.0,2.1,2.2,2.3,..,..,..,..,..,..,..,..,..,
"Suriname","SUR",3.0,3.2,4.3,..,..,..,..,..,..,..,..,..,..,
"Swaziland","SWZ",2.5,2.7,..,..,..,..,..,..,..,..,..,..,..,
"Sweden","SWE",9.2,9.2,9.2,9.3,9.3,9.0,9.4,9.4,9.5,9.4,9.1,8.7,8.0,
"Switzerland","CHE",9.1,9.1,9.1,8.8,8.5,8.4,8.6,8.9,8.9,8.6,8.8,9.0,8.4,
"Syrian Arab Rep","SYR",2.9,3.4,3.4,3.4,..,..,..,..,..,..,..,..,..,
"Taiwan","TWN",5.9,5.9,5.6,5.7,5.6,5.9,5.5,5.6,5.3,5.0,5.0,5.1,6.0,
"Tajikistan","TJK",2.2,2.1,2.0,1.8,..,..,..,..,..,..,..,..,..,
"Tanzania","TZA",2.9,2.9,2.8,2.5,2.7,2.2,2.5,1.9,1.9,..,..,..,..,
"Thailand","THA",3.6,3.8,3.6,3.3,3.2,3.2,3.2,3.2,3.0,3.1,3.3,1.9,2.4,
"Timor-Leste","TMP",2.6,..,..,..,..,..,..,..,..,..,..,..,..,
"Togo","TGO",2.4,..,..,..,..,..,..,..,..,..,..,..,..,
"Trinidad and Tobago","TTO",3.2,3.8,4.2,4.6,4.9,5.3,..,..,..,..,..,..,..,
"Tunisia","TUN",4.6,4.9,5.0,4.9,4.8,5.3,5.2,5.0,5.0,..,..,..,..,
"Turkey","TUR",3.8,3.5,3.2,3.1,3.2,3.6,3.8,3.6,3.4,3.2,3.5,4.1,4.1,
"Turkmenistan","TKM",2.2,1.8,2.0,..,..,..,..,..,..,..,..,..,..,
"Uganda","UGA",2.7,2.5,2.6,2.2,2.1,1.9,2.3,2.2,2.6,..,2.7,3.3,0.7,
"Ukraine","UKR",2.8,2.6,2.2,2.3,2.4,2.1,1.5,2.6,2.8,..,..,..,..,
"United Arab Emirates","ARE",6.2,6.2,6.1,5.2,..,..,..,..,..,..,..,..,..,
"United Kingdom","GBR",8.6,8.6,8.6,8.7,8.7,8.3,8.7,8.6,8.7,8.2,8.4,8.3,8.0,
"United States","USA",7.3,7.6,7.5,7.5,7.7,7.6,7.8,7.5,7.5,7.6,7.7,7.8,8.4,
"Uruguay","URY",6.4,5.9,6.2,5.5,5.1,5.1,..,4.4,4.3,4.1,..,..,..,
"Uzbekistan","UZB",2.1,2.2,2.3,2.4,2.9,2.7,2.4,1.8,..,..,..,..,..,
"Venezuela","VEN",2.3,2.3,2.3,2.4,2.5,2.8,2.7,2.6,2.3,2.8,2.5,2.5,3.2,
"Viet Nam","VNM",2.6,2.6,2.6,2.4,2.4,2.6,2.5,2.6,2.5,2.8,..,..,..,
"Yemen","YEM",2.6,2.7,2.4,2.6,..,..,..,..,..,..,..,..,..,
"Zambia","ZMB",2.6,2.6,2.6,2.5,2.6,2.6,3.4,3.5,3.5,..,..,..,..,
"Zimbabwe","ZWE",2.4,2.6,2.3,2.3,2.7,2.9,3.0,4.1,4.2,

Footnotes
No footnotes

Source
"Internet Center for Corruption Research. 2006. Corruption Perceptions Index. Berlin: Internet Center for Corruption Research. Available online at  http://www.icgg.org/corruption.cpi_olderindices.html."
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"Original data can be obtained at:"
"Transparency International. 2006.  2006 Corruption Perceptions Index. Berlin: Transparency International. Available online at  http://www.transparency.org/policy_and_research/surveys_indices/cpi."


Technical Notes
"The Corruption Perceptions Index (CPI) measures the degree to which corruption is perceived to exist among public officials and politicians.  Ratings range in value from 10 (least corrupt) to 0 (most corrupt).  The survey measures public sector corruption or the abuse of public office for private gain. It measures local and national governments, not domestic and foreign corporations doing business in these countries."
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"CPI is based solely on perceptions instead of hard empirical data such as cross country comparisons of prosecutions or media coverage of corruption. Empirical data are not used because they may measure the extent of anti-corruption efforts instead of the extent of corruption."
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"Years Covered and Frequency of Update"
"Annual data are available for 1996-2006, with coverage of countries generally increasing over time. A few data points are available for ranges of years (1980-85, 1988-92.)  The most recent data set, released in November 2006, includes 163 countries. "
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"Methodology "
"The CPI is a composite index compiled from surveys originating from different independent institutions. The CPI for 2006 was compiled from 12 surveys originating from 9 different independent institutions. A country is included in the CPI only if there are data available from 3 or more surveys.  The surveys measure the perceptions of local residents, expatriates, business people, academics and risk analysts. The following link lists the sources, along with information on the range and standard deviation of survey results and composite confidence intervals for each country: http://www.transparency.org/content/download/1521/7934/file/methodology.pdf."
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"Each survey is standardized so that its scaling system matches the CPI's index of 0-10.  According to the data provider, ""the aim of the standardization process is to ensure that inclusion of a source consisting of a certain subset of countries should not change the mean and standard deviation of the subset of countries in the CPI.""  Once survey values are standardized, each available source was weighted equally for each country to produce the composite CPI."
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"Survey results are combined in three-year periods to reduce abrupt variations that could potentially be caused by errors.  Thus, figures for 2006 are based not only on surveys taken in 2006, but in 2004 and 2005 as well.  For further information, please consult: http://www.transparency.org/policy_research/surveys_indices/cpi. "
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"Data Reliability"
"Transparency International is recognized as a world leader in measuring corruption.  Survey responses from residents in each country correlate well with responses from experts abroad.  The data are reproducible and the index components are clear.  Overall, the data are therefore considered to be reliable."
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"Nonetheless, there is an unavoidable amount of subjectivity in any index calculation.  Users should bear in mind that this index is measuring ideas and behaviors rather than a discrete physical quantity.  Underlying surveys are conducted in many different countries, and cultural biases may skew results.  Therefore, while the CPI can illustrate rough comparisons, rankings and rigid score comparisons are discouraged.  Confidence intervals are available in tabular format online at:  http://www.transparency.org/policy_research/surveys_indices/cpi/2006."
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"The CPI was not designed for making comparisons across years.  Year-to-year variation in scores is affected by changes in survey samples and methodology, as well as variation in the sources available.  However, findings indicate that in general, trends in the data over time tend to result from actual changes in perceptions of corruption rather than from technical factors.  Nevertheless, caution should be used when making any comparisons across years.  Intertemporal comparisons should be based upon a country's score rather than its ranking."