Burundi is a low-income developing country with a population of 10.5 million (July 2012 CIA World Fact book), an annual population growth of 2.4 percent, and more than 300 inhabitants per km2. This makes Burundi the country with the second highest population density in sub-Saharan Africa. Burundi remains one of the poorest countries in the world with a per capita gross national income (GNI) of $170, and it is considered one of the world's 40 "Heavily Indebted Poor Countries". Additionally, it is worth noting that a civil war, which lasted 13 years from 1993, killed more than 300,000 people, severely weakened the health and social welfare systems and negatively affected donor support and private sector investment in Burundi.