That is a "perceptions" index. Note corruption is not something which can be reduced to a scalar value and analyzed like temperature or pressure. It's far more multivariate and complex than that.
Even if, for the sake of argument, it was possible to do so, you would have to interrogate the methodology used to produce this value. Note the complexity in analyzing corruption by country. How does one investigate in detail, the governments of almost 200 countries? If one relies on survey results from members of those countries, how was the survey consistently conducted across language barriers, cultural barriers, and legal barriers?
Finally, even if you believe all of those incredibly dubious factors were accounted for, it could be possible that being 14th in a world that is becoming more corrupt does not mean that Canada is improving in that regard.