There is considerable potential for tourism in Malawi. The tourist industry has grown greatly since the mid-1970s, and the Malawian government is attempting to expand it further. The tourist sector was badly affected in the 1980s by an economic recession in South Africa, the source of most of Malawi's tourists. The industry was also badly affected by the destabilization of Zimbabwe. The tourist industry promotes Malawi's national parks including Nyika National Park, Kasungu National Park, and Liwonde National Park.