On Average, Private Industry Health Insurance Employer Costs Are 7.9 Percent Of Compensation

From US Department of Labor, Bureau of Labor Statistics, Economic News Release, "Employer Costs for Employee Compensation - March 2014":

Health insurance costs in private industry

The average cost for health insurance benefits was $2.36 per hour worked in private industry (7.9
percent of total compensation) in March 2014. In March 2004, employer costs for health benefits
averaged $1.53, or 6.6 percent of total compensation.***Employer costs for health insurance benefits were significantly higher for union workers, averaging $5.54 per hour worked (12.6 percent of total compensation), than for nonunion workers, averaging $2.04 (7.1 percent).