Germany's system of hospitals, called , dates from medieval times, and today, Germany has the world's oldest universal health care system, dating from Bismarck's social legislation of the 1880s. Since the 1880s, reforms and provisions have ensured a balanced health care system. The population is covered by a health insurance plan provided by statute, with criteria allowing some groups to opt for a private health insurance contract. According to the World Health Organization, Germany's health care system was 77% government-funded and 23% privately funded . In 2014, Germany spent 11.3% of its GDP on health care.