How true is this info graphic?

http://i.kinja-img.com/gawker-media/image/upload/s--B9sa1AW8--/yunrl7fmeiespkovaghp.jpg

I noticed that it doesn't have years of experience to achieve that salary for each language nor what year are these figure based on.

I am thinking in learning a programming language to make games and I came across this on my research.

Please advise.