Haiti is the poorest nation in the western hemisphere. The UN Millennium Development Goals are a series of collective priorities for peace and security, development, poverty reduction, the environment and human rights which the UN is striving to meet by 2015. By the measure of most of these stated goals, Haiti is in decline. Infant mortality stands at 74 per 1,000 births and maternal mortality at 520 per 100,000 births. The percentage of children under age one vaccinated against measles is less than half of Sub-Saharan Africa — the poorest region on earth. With a school enrolment rate of only 60%, boys attend school for just four years on average, and girls for half of that time; universal education by 2015 is unlikely to be achieved.