According to the World Health Organization, women comprise 50% of people living with HIV. The proportion of HIV cases that can be attributed to the result of homosexual relations varies according to geography. In Russia, among newly registered HIV cases in 2006 where the mode of transmission was known, about one half was due to heterosexual intercourse, and this proportion has been steadily increasing. Almost 60% of cases were attributed to unsafe sex between men. In the Caribbean, it is estimated that about 40% of reported HIV cases are the result of unsafe sex between men. About 53% of newly diagnosed HIV infections in the United States, in 2005, were among men who have sex with men. The largest proportion of new HIV infection in Canada, in 2002, was accounted for by unprotected sex between men, whereas in Western Europe the highest proportion was accounted for by heterosexual intercourse.