A study last year by the association indicated that 40 percent of its 360 members offer coverage for the procedure.
At that auction, 70 percent of the cars offered did not sell.
About 20 percent of the nation's utilities offer customers so-called green power.
The study found that roughly 10 percent of firms offered such plans to their workers.
Among companies with 50 to 99 employees, 36 percent offered paid leave after a birth.
By contrast, 98 percent of businesses with more than 200 employees offer coverage.
Last year, according to the center, only 23 percent of sites offered such services.
"Only 26 percent of companies with fewer than 50 workers offer any health benefit."
And 85 percent of employers are offering higher initial salaries than last year.
In 2004, he said, less than 40 percent of those companies offered the three-year packages.
