Strong economic growth, averaging approximately 6% per annum, marked the first ten years of independence under conservative JLP governments; these were led by successive Prime Ministers Alexander Bustamante, Donald Sangster (who died of natural causes within two months of taking office) and Hugh Shearer. The growth was fuelled by high levels of private investment in bauxite/alumina, tourism, the manufacturing industry and, to a lesser extent, the agricultural sector. In the 1967 Jamaican general election, the JLP were victorious again, winning 33 out of 53 seats, with the PNP taking 20 seats.