After Galtung's resignation in 1969, the institute staff elected a leader for one year at a time. In 1986 this was changed to a three-year period, and again in 1993 to a maximum of two consecutive four-year periods. PRIOs first chairman of the board was Erik Rinde (1966–79), director of Institute for Social Research. He was succeeded by Torstein Eckhoff (1979–1986), Bernt Bull (1987–94), Frida Nokken (1995-2000), Helge Pharo (2000–2003), Øyvind Østerud (2004–06), Bernt Aardal (2007–2016) and Åslaug Marie Haga (2016 - present). The institute's purpose, as formulated in the statutes, is "to engage in research concerning the conditions for peaceful relations between nations, groups and individuals". Researchers come from a variety of disciplines in the social sciences and humanities, including political science, sociology, anthropology, psychology, human geography, history, history of religion, and philosophy. Output from the research is primarily published as articles in peer-reviewed academic journals, anthologies or monographs, but also as more policy-oriented reports and papers such as PRIO's in-house series. Approximately 15 percent of the institute's budget is made up of a core grant from the Research Council of Norway, and the remaining 85 per cent is funded on project basis. The two largest project funders are the Research Council of Norway and the Norwegian Ministry of Foreign Affairs. Other funders include the European Union, the World Bank, and the Norwegian Ministry of Defence. In 2009, PRIO initiated the founding of the US based Peace Research Endowment. In Oslo, PRIO hosted the Norwegian Initiative on Small Arms Transfers, which was shut down in 2017 due to lack of funding. This was a joint initiative of PRIO, the Norwegian Red Cross and the Norwegian Church Aid to help block the spread of small arms to areas where they are likely to be used in warfare, armed violence or human rights abuses. The staff comprises a core group of 40-50 full-time researchers and support staff. In addition, there are researchers with a part-time affiliation with PRIO, visiting scholars, interns and students. From 2003 to 2012, PRIO hosted the Centre for the Study of Civil War, one of the original 13 "Centres of Excellence" in Norway. The director for the full 10-year period was Scott Gates. The institute maintains a centre in Nicosia, Cyprus, known as the PRIO Cyprus Centre.