When a military coup in 1961 led by general Park Chung-hee overthrew the Democratic Party, the result was a military junta under the SCNR. During this time, the first national Five-Year Plan (1962–1966) was implemented, becoming an important factor in the Miracle on the Han River. It aimed to develop the nation's economy through expansion of agriculture and energy industries such as coal and electric power; development of basic industries such as chemical fertilizer, cement, oil refinery, iron, and steel; expansion of social overhead capital including roads, railways, and ports; full utilisation of idle resources including increased employment; conservation and utilisation of land; export promotion to improve the balance of payments; and promotion of science and technology. While this first Five-Year Plan did not bring about an immediately self-reliant economy, it brought a period of growth and modernization in preparation for long-term economic success and policy reform.