The Global Financial Centres Index (GFCI) is a ranking of the competitiveness of financial centres based on over 29,000 financial centre assessments from an online questionnaire together with over 100 indices from organisations such as the World Bank, the Organisation for Economic Co-operation and Development (OECD), and the Economist Intelligence Unit. The first index was published in March 2007. It has been jointly published twice per year by Z/Yen Group in London and the China Development Institute in Shenzhen since 2015,[1] and is widely quoted as a top source for ranking financial centres.[2][3][4][5]