According to CMS, the Medicaid program provided health care services to more than 46.0 million people in 2001. In 2002, Medicaid enrollees numbered 39.9 million Americans, the largest group being children (18.4 million or 46 percent). From 2000 to 2012, the proportion of hospital stays for children paid by Medicaid increased by 33 percent, and the proportion paid by private insurance decreased by 21 percent. Some 43 million Americans were enrolled in 2004 (19.7 million of them children) at a total cost of $295 billion. In 2008, Medicaid provided health coverage and services to approximately 49 million low-income children, pregnant women, elderly people, and disabled people. In 2009, 62.9 million Americans were enrolled in Medicaid for at least one month, with an average enrollment of 50.1 million. In California, about 23% of the population was enrolled in Medi-Cal for at least 1 month in 2009-10.
Question: How many years have the hospital stay for children paid by medicaid increased?
Answer: 12