This article presents findings from the Kaiser/HRET Survey of Employer Health Benefits.  The survey found that family premiums increased 5 percent in 2009.  Average annual premiums were $4,824 for single coverage and $13,375 for family coverage. 

Claxton, G., DiJulio, B., Whitmore, H. et al. (2009). Job-based health insurance: costs climb at a moderate pace. Health Affairs, 28(6): w1002-1012. DOI: 10.1377/hlthaff.28.6.w1002 http://content.healthaffairs.org/cgi/content/abstract/28/6/w1002 

Authors:  Gary Claxton, Bianca DiJulio, Heidi Whitmore, Jeremy Pickreign, Megan McHugh, Benjamin Finder, Awo Osei-Anto.