According to a recent report, from 1999/2000 to 2010/2011:

• The national percentage of private-sector firms offering employer-sponsored health insurance fell from 58.9% to 52.4%
• Single-person health insurance premium costs doubled (from $2,490 to $5,081)
• Family premiums rose 125% (from $6,415 to $14,447)
• Employee contributions increased (from 17.5% to 20.8% of the total premium)

Source: "State-Level Trends in Employer-Sponsored Health Insurance: A State-by-State Analysis," Robert Wood Johnson Foundation, Aprill 11, 2013, http://www.rwjf.org/en/research-publications/find-rwjf-research/2013/04/state-level-trends-in-employer-sponsored-health-insurance.html