From the site which you posted. Did you even bother to read the comments on this site?
" **DEFINITION:** A CPI Score relates to perceptions of the degree of corruption as seen by business people and country analysts and ranges between 10 (highly clean) and 0 (highly corrupt). Includes [police](http://www.nationmaster.com/graph-T/cri_pol) [corruption](http://www.nationmaster.com/graph-T/gov_cor), business [corruption](http://www.nationmaster.com/graph-T/gov_cor), political [corruption](http://www.nationmaster.com/graph-T/gov_cor), etc. Data for 2005. "
Go to a school and learn about survey/statistics before posting like this.