or companies linked to international terrorism have been blacklisted to have their assets frozen. Thus far, Swiss authorities have blocked about 72 accounts totalling U.S.$22.6 million. EU and other international organizations Switzerland and Denmark signed a treaty of Friendship in 1875. Switzerland is a member of many international organisations, including the World Trade Organization, Organisation for Economic Co-operation and Development, European Free Trade Association, Council of Europe, Organization for Security and Cooperation in Europe, International Atomic Energy Agency, and International Telecommunications Satellite Organization. Its central bank is a member of the Bank for International Settlements, based in Basel. Switzerland is an active participant in the Organization for Security and Co-operation in Europe, its foreign minister serving as Chairman-in-Office for 1996. Switzerland also is an active participant in the major nonproliferation and export control regimes. Although it is surrounded by member nations, Switzerland is not a member nation of the European Union. In 1992 Swiss voters approved membership in the International Monetary Fund and the World Bank, but later that year rejected the European Economic Area agreement, which the government viewed as a first step toward European Union membership. The Swiss instead take part in the European single market and Schengen through bilateral treaties.More complete list of memberships: ACCT, AfDB, AsDB, Australia Group, BIS, CE, CERN, CGPM, EAPC, EBRD, ECE, EFTA, ESA, FAO, G-10, IADB, IAEA, IBRD (World Bank), ICAO, ICC, ICC, ICDO, ICFTU, ICMM, ICRM, IDA, IEA, IFAD, IFC, IFCS, IFRCS, IGC, ILO, IMF, IMO, Inmarsat, Intelsat, Interpol, IOC, IOM, ISO, ITU, IWC, LAIA (observer), NAM (guest), NEA, NSG, OAS (observer), OECD, OIE, OPCW, OSCE, OTIF, PCA, PFP, UNCTAD, UNESCO, UNHCR, UNIDO, UNITAR, UNMIBH, UNMIK, UNMOP, UNOMIG, UNTSO, UNU, UPU, WCL, WCO, WHO, WIPO, WMO, WToO, WTrO, ZC. Participation in peacekeeping While the Swiss electorate did reject a government proposition to directly deploy Swiss troops as UN peacekeepers (the Blue Helmets) in 1994, a total of 23 Swiss personnel including police and military observers (the Blue Berets) have served or are now serving for the United Nations. These dispositions are impartial, clearly defined and cover a number of UN projects around the globe. In 1996 Switzerland joined NATO's Partnership for Peace, the Euro-Atlantic Partnership Council in 1997, and deployed Yellow Berets to support the OSCE in Bosnia. In June 2001, Swiss voters approved new legislation providing for the deployment of armed Swiss troops for international peacekeeping missions under UN or