The USDA`s trade databases also contain certain „non-agricultural“ raw materials. These include products obtained from plants or animals (such as yarns, fabrics, textiles, leather, clothing, cigarettes and cigars, as well as spirit drinks) or products used in the agricultural production process (such as agricultural chemicals, fertilisers and agricultural machinery). Other „non-agricultural“ raw materials in USDA trade databases are fishery and seafood products because of their food value (the USDA cooperating with the fishing industry to promote exports) and solid wood products (since the USDA also cooperates with the U.S. industry to promote the export of these products). The North American Free Trade Agreement (NAFTA) was implemented to promote trade between the United States, Canada and Mexico. The agreement, which eliminated the largest number of tariffs on trade between the three countries, entered into force on 1 January 1994. Many tariffs, particularly in the agriculture, textile and automotive sectors, were phased out between 1 January 1994 and 1 January 2008. Many have been frustrated by the persistent and protracted disputes between the United States and its NAFTA partners over trade in certain agricultural commodities. Disputes related to the request for SPS and TBT measures, such as import and certification certificate requirements, are also the source of trade concerns regarding the application of national subsidy programmes that have not been explicitly addressed in the agreement.