The Government of Peru's economic stabilization and liberalization program lowered trade barriers, eliminated restrictions on capital flows, and opened the economy to foreign investment, with the result that Peru now has one of the most open investment regimes in the world. Between 1992 and 2001, Peru attracted almost $17 billion in foreign direct investment in Peru, after negligible investment until 1991, mainly from Spain (32.35%), the United States (17.51%), Switzerland (6.99%), Chile (6.63%), and Mexico (5.53%). The basic legal structure for foreign investment in Peru is formed by the 1993 constitution, the Private Investment Growth Law, and the November 1996 Investment Promotion Law. Although Peru does not have a bilateral investment treaty with the United States, it has signed an agreement (1993) with the Overseas Private Investment Corporation (OPIC) concerning OPIC-financed loans, guarantees, and investments. Peru also has committed itself to arbitration of investment disputes under the auspices of ICSID (the World Bank'sInternational Center for the Settlement of Investment Disputes) or other international or national arbitration tribunals.