Isn't the title a bit misleading? According to the chart, Java is the most popular language of the year (and the decade, if you take a look at https://sites.google.com/site/pydatalog/pypl/PyPL-PopularitY...).
I would think one of the key metrics in determining popularity would be popularity ...
http://www.google.com/trends/explore?hl=en-US#q=Java%20tutor...
And also there you can see that India is still the biggest searcher of programming tutorials in the world.