From the time of the establishment of the Irish Free State, government policy was to encourage development of domestic industry by maintaining protective tariffs and quotas on commodities that would compete with Irish-made products. Following Ireland's admission to the European Community (now the European Union), the country's tariff schedule was greatly revised. The schedule vis-à-vis third-world countries and the United States was gradually aligned with EC tariffs and customs duties between Ireland and the EC were phased down to zero by July 1977. Duty rates on manufactured goods from non-EU countries range from 5% to 8%, while most raw materials enter duty-free. Certain goods still require import licenses and tariffs are based on the Harmonized System. The Shannon Free Trade Zone, the oldest official free trade area in the world, is located at the Shannon International Airport.