Suriname's democracy gained some strength after the turbulent 1990s, and its economy became more diversified and less dependent on Dutch financial assistance. Bauxite (aluminium ore) mining used to be a strong revenue source. The discovery and exploitation of oil and gold has added substantially to Suriname's economic independence. Agriculture, especially rice and bananas, remains a strong component of the economy, and ecotourism is providing new economic opportunities. More than 93% of Suriname's land-mass consists of unspoiled rain forest; with the establishment of the Central Suriname Nature Reserve in 1998, Suriname signalled its commitment to conservation of this precious resource. The Central Suriname Nature Reserve became a World Heritage Site in 2000.