 Aid agencies define the prevalence of FGM as the percentage of the 15–49 age group that has experienced it.These figures are based on nationally representative household surveys known as Demographic and Health Surveys (DHS), developed by Macro International and funded mainly by the United States Agency for International Development (USAID); and Multiple Indicator Cluster Surveys (MICS) conducted with financial and technical help from UNICEF.These surveys have been carried out in Africa, Asia, Latin America and elsewhere roughly every five years, since 1984 and 1995 respectively.