Agricultural production is an important contributor to Jamaica's economy. However, it is vulnerable to extreme weather, such as hurricanes and to competition from neighbouring countries such as the USA. Other difficulties faced by farmers include thefts from the farm, known as praedial larceny. Agricultural production accounted for 7.4% of GDP in 1997, providing employment for nearly a quarter of the country. Jamaica's agriculture, together with forestry and fishing, accounted for about 6.6% of GDP in 1999. Sugar has been produced in Jamaica for centuries, it is the nation's dominant agricultural export. Sugar is produced in nearly every parish. The production of raw sugar in the year 2000 was estimated at 175,000 tons, a decrease from 290,000 tons in 1978.