The prevalence of circumcision is the percentage of males in a given population who have been circumcised. The rates vary widely by country, from virtually 0% in Honduras and Japan, to 6.6% in Spain, to 20.7% in the United Kingdom, to 45% in South Africa, to 75% in the United States, to over 90% in Israel and many Muslim-majority countries. In 2010, the World Health Organization (WHO) estimated 30% of adult males worldwide (aged 15+) are circumcised, with about two-thirds of those being Muslims.