Before 1980, Chiles health system was publicly financed through social security and public funds. After health reform in 1981, however, risk insurance was introduced, and market mechanisms began to regulate levels of protection. By 2006, a dual system of coverage was in place. The National Health Care Fund, funded by federal government tax revenues and by premiums from beneficiaries, covered 69% of the population, but its resource constraints have prevented it from ensuring timely and quality services.