Tonga's economy relies on several basic elements, including subsistence production agricultural exports, the remittances of Tongan migrants, and international aid. Squash, vanilla beans, and yams are the main crops. Agricultural exports, including fish, make up two-thirds of total exports. The industrial sector accounts for only 10% of GDP. Tourism is the second-largest source of hard currency earnings following remittances. The country must import a high proportion of its food, mainly from New Zealand.