I don't know how they get the salary and if it is overall package. I use the following 3 sites 1. http://www.glassdoor.com self-reported, and has bonus, etc, mostly average 2. http://www.payscale.com from survey and research, have different segmentation based on experience, etc 3. http://www.salarylist.com real individual salary from government, not updated often, last update seems is 2010