The structure of the Pakistani Government is a federal democracy, comprised of four major provinces namely Punjab, Sindh, Balochistan, and Khyber Pakhtunkhwa (formerly North-West Frontier Province), one minor province of Gilgit-Baltistan.. The country has a per-capita income (PPP, current international $) of US$ 2,655.3 and is ranked 110 out of 186 countries in HDI. Pakistan remains impoverished and underdeveloped. The Gender Inequality Index for Pakistani is 0.567 and ranked 123 out of 186; 55% of females above 15 are illiterate. 36% of the population is under 15 years of age with a life expectancy 63. Only 48% of the population has access to sanitation.