Chart 5. The title is "HMO Enrollment Rose Sharply through 1998 as Employers Sought to Contain Health Care Costs." This is a bar graph showing that HMO enrollment as a percentage of the population has steadily risen from 15 percent in 1993 to 28 percent in 1998. Figures for 1999 and 2000 show a slight decrease in growth to about 26 percent.