 Many work in the free-trade areas such as Zona Franca America and earn roughly double the national average for service work.This sector generated US$4.6 billion in 2016, nearly as much as tourism.In 2013, the total FDI stock in Costa Rica amounted to about 40 percent of GDP, of which investments from the United States accounted for 64 percent, followed by the United Kingdom and Spain with 6 percent each.