By 1980, Jamaica's gross national product had declined to some 25% below its 1972 level. Seeking change, Jamaicans voted the JLP back in in 1980 under Edward Seaga, the JLP winning 51 seats to the PNP's nine seats. Firmly anti-Communist, Seaga cut ties with Cuba and sent troops to support the US invasion of Grenada in 1983. The economic deterioration, however, continued into the mid-1980s, exacerbated by a number of factors. The largest and third-largest alumina producers, Alpart and Alcoa, closed; and there was a significant reduction in production by the second-largest producer, Alcan. Reynolds Jamaica Mines, Ltd. left the Jamaican industry. There was also a decline in tourism, which was important to the economy. Owing to rising foreign and local debt, accompanied by large fiscal deficits, the government sought International Monetary Fund (IMF) financing, which was dependent on implementing various austerity measures. These resulted in strikes in 1985 and a decline in support for the Seaga government, exacerbated by criticism of the government's response to the devastation caused by Hurricane Gilbert in 1988. Having now de-emphasised socialism and adopting a more centrist position, Michael Manley and the PNP were re-elected in 1989, winning 45 seats to the JLP's 15.