Established on 17 May 1930, the Bank for International Settlements (BIS) is the world's oldest international financial organisation. The BIS has 60 member central banks, representing countries from around the world that together make up about 95% of world GDP. The head office is in Basel, Switzerland and there are two representative offices: in the Hong Kong Special Administrative Region of the People's Republic of China and in Mexico City. The mission of the BIS is to serve central banks in their pursuit of monetary and financial stability, to foster international cooperation in those areas and to act as a bank for central banks.