Tourism in Eritrea made up 2% of Eritrea's economy up to 1997. After 1998, revenues from tourism fell to one quarter of 1997 levels. In 2006 it made up less than 1% of the country's GDP. The World Tourism Organization calculated that the country's international tourism receipts in 2002 were just US$ 73 million. The government has started a twenty-year plan to develop the country's tourist industry. However, the development of tourism is hampered by drought, political instability, and war.