The constitution of Albania guarantees equal, free and universal health care for all its citizens. The health care system of the country is currently organised in three levels, among others primary, secondary and tertiary healthcare, and is in a process of modernisation and development. The life expectancy at birth in Albania is at 77.8 years and ranks 37th in the world outperforming several developed countries. The average healthy life expectancy is at 68.8 years and ranks as well 37th in the world. The country's infant mortality rate is estimated at 12 per 1,000 live births in 2015. In 2000, the country had the 55th best healthcare performance in the world, as defined by the World Health Organization.