Some background on these ratings, quoted directly from their website:
> TIOBE Software BV was founded the 1st of October 2000 by Paul Jansen. The name TIOBE stands for “The Importance Of Being Earnest”.
> Since there are many questions about the way the TIOBE index is assembled, a special page is devoted to its definition. Basically the calculation comes down to counting hits for the search query +"<language> programming"
> Popular search engines such as Google, Bing, Yahoo!, Wikipedia, Amazon, YouTube and Baidu are used to calculate the ratings.