Tourism, Maldives’ largest economic activity, accounts for 28% of GDP and more than 60% of foreign exchange receipts. Over 90% of government tax revenue comes from import duties and tourism-related taxes. Fishing is the second leading sector. Agriculture and manufacturing continue to play a lesser role in the economy, constrained by the limited availability of cultivable land and the shortage of domestic labor. Most staple foods must be imported. The Maldivian Government implemented economic reforms, beginning in 1989 that initially lifted import quotas, opened some exports to the private sector, and liberalized regulations to allow more foreign investment.