As of 2017, Medicaid and Medicare have become an increasingly large part of the private health insurance industry, particularly with the rise of Medicare Advantage programs. As of 2018, two-thirds of Medicaid enrollees are in plans administered by private companies for a set fee. These may involve some sort of value-based system; in addition, the contracted companies may be evaluated on population health statistics, as in the case of California's Medi-Cal which tasked its companies with improving the health of its members.