The world's largest recorded music markets are listed annually by the International Federation of the Phonographic Industry (IFPI). The ranking is based on retail value (rather than units) each market generates respectively per year; retail value generated by each market varies from year to year. As all financial data is given in US dollars, annual rates of change for all countries other than the United States are heavily influenced by exchange rate fluctuations, as well as by actual changes in revenue in local currency terms.