In 2017 Cambodia's per capita income is $4,022 in PPP and $1,309 in nominal per capita. The United Nations designates Cambodia as a least developed country. Most rural households depend on agriculture and its related sub-sectors. Rice, fish, timber, garments, and rubber are Cambodia's major exports. The International Rice Research Institute (IRRI) reintroduced more than 750 traditional rice varieties to Cambodia from its rice seed bank in the Philippines. These varieties had been collected in the 1960s.