"Due to a high number of outliers in the data, the 2015 salary number was revised to better reflect a change in outlier methodology and an adjusted number has been reported this year."

This is getting hit on constantly, but still interesting that the average of about 100k has a pretty big delta versus:

"the total comp for “a good hacker” is $250k+/yr, not even counting perks like free food and having really solid insurance." (http://danluu.com/startup-tradeoffs/)