Panama's dollarised economy rests primarily on a well-developed services sector that accounts for three-fourths of GDP. Services include operating the Panama Canal, banking, the Colon Free Zone, insurance, container ports, flagship registry, and tourism. A slump in Colon Free Zone and agricultural exports, the global slowdown, and the withdrawal of US military forces held back economic growth in 2000-03. The government has been backing public works programs, tax reforms, new regional trade agreements, and development of tourism in order to stimulate growth. Unemployment remains at an unacceptably high level.