Here is the heat map of questions asked in each year against first 60 tags in stackowerflow.com. Its start from August 2008 to August 2013. Mouse over each cell to see the questions count.You can sort the data in yearly wise by clicking on the bottom year tab. The tags will be rearranged in descending order of the number of questions asked in each year. Out of 60 tags first 40 only is shown at a time.

In 2008-2009 c#leads with 30777questions followed by .net, java , asp.netand so far. So after one year the stackoverflow.com is started c#got a count of 30K.Where java got 16K, javascriptgot 11K, c++and phpgot 10K. In 2009-2010 c#got 2x increase in number to 63K and javacame to second position with 41K with 2.5x increase php, javascript3rd and 4th respectively with 3x increase. JQuerycomes to 5th with 4.6x increase , we can see the jump of objective-cand android.

In 2010-11 first 4 remains in the same position but androidcomes to 5th with 63K questions. and ioscame into scene with 16K from 500 question in the previous year. in this year c#hit almost 100K . In 2011-12 javascriptto 3rd , androidcame to 4th and phpis down to 5th , people choose tagging iosinsted of iPhone.

In 2012-2013 finally c# is down to 4th after a continuous four years of keeping the highest count. Java came to 1st with 165K questions and javascript to 2nd with 164K questions. Android came to 3rd with 152K. Python too increased its position to 7th with 81K. Ruby-on-rails almost hold it same position with 42K. Another interesting appearance are r and html5.