Almost five centuries as a Portuguese colony came to a close with independence in 1975. Large-scale emigration, economic dependence on South Africa, a severe drought, and a prolonged civil war hindered the country's development until the mid-1990s. The ruling Front for the Liberation of Mozambique (FRELIMO) party formally abandoned Marxism in 1989, and a new constitution the following year provided for multiparty elections and a free market economy. A UN-negotiated peace agreement between FRELIMO and rebel Mozambique National Resistance (RENAMO) forces ended the fighting in 1992. In 2004, Mozambique underwent a delicate transition as Joaquim CHISSANO stepped down after 18 years in office. His elected successor, Armando GUEBUZA, served two terms and then passed executive power to Filipe NYUSI in 2015. RENAMO’s residual armed forces have intermittently engaged in a low-level insurgency since 2012, although a late December 2016 ceasefire held throughout 2017.