Croatia has a universal health care system, whose roots can be traced back to the Hungarian-Croatian Parliament Act of 1891, providing a form of mandatory insurance of all factory workers and craftsmen. The population is covered by a basic health insurance plan provided by statute and optional insurance. In 2017, annual healthcare related expenditures reached 22.0 billion kuna (€3.0 billion). Healthcare expenditures comprise only 0.6% of private health insurance and public spending. In 2017, Croatia spent around 6.6% of its GDP on healthcare.