"The proportion of employees covered by employer-sponsored medical care plans in private industry has fallen gradually over the last decade. In March 2003, 45 percent of employees had elected medical care coverage, down from 63 percent in 1992-3."
"These data are from the BLS National Compensation Survey program. Learn more in Employee Benefits in Private Industry, 2003 (PDF) (TXT), news release USDL 03-489."