The constitution entitles Iranians to basic health care. By 2008, 73% of Iranians were covered by the voluntary national health insurance system. Although over 85% of the population use an insurance system to cover their drug expenses, the government heavily subsidizes pharmaceutical production/importation. The total market value of Iran's health and medical sector was $24 billion in 2002 and was forecast to rise to $50 billion by 2013. In 2006, 55 pharmaceutical companies in Iran produced 96% (quantitatively) of the medicines for a market worth $1.2 billion. This figure is projected to increase to $3.65 billion by 2013.