copper prices remained depressed, it became increasingly difficult to service its growing debt. By the mid-1990s, despite limited debt relief, Zambia's per capital foreign debt remained among the highest in the world. Democratisation In June 1990 riots against Kaunda accelerated. Many protesters were killed by the regime in breakthrough June 1990 protests. In 1990 Kaunda survived an attempted coup, and in 1991 he agreed to reinstate multiparty democracy, having instituted one-party rule under the Choma Commission of 1972. Following multiparty elections, Kaunda was removed from office (see below). On 30 December 1991, at a private ceremony, the newly installed president Frederick Chiluba declared Zambia as a Christian state with Christianity as its official religion. In the 2000s, the economy stabilised, attaining single-digit inflation in 2006–2007, real GDP growth, decreasing interest rates, and increasing levels of trade. Much of its growth is due to foreign investment in mining and to higher world copper prices. All this led to Zambia being courted enthusiastically by aid donors and saw a surge in investor confidence in the country. On 20 January 2015, following the death of Michael Sata, nominee Edgar Lungu won the presidential election with 807,625 popular votes. Politics Politics in Zambia take place in a framework of a presidential representative democratic republic, whereby the President of Zambia is both head of state and head of government in a pluriform multi-party system. The government exercises executive power, while legislative power is vested in both the government and parliament. Zambia became a republic immediately upon attaining independence in October 1964. From 2011 to 2014, Zambia's president had been Michael Sata, until Sata died on 28 October 2014. After Sata's death, Vice President Guy Scott, a Zambian of Scottish descent, became acting President of Zambia. Presidential elections were held on 22 January 2015. A total number of 11 presidential candidates contested in the election and On 24 January 2015, it was announced that Edgar Chagwa Lungu had won the election to become the 6th President in a tightly contested race. He won 48.33% of the vote, a lead of 1.66 percentage points (3.56%) over his closest rival, Hakainde Hichilema, with 46.67%. Nine other candidates all got less than 1% each. In August 2016 Zambian general election president Edgar Lungu won re-election narrowly in the first round of the election. The opposition had allegations of fraud and the governing Patriotic Front (PF) rejected the allegations made