Sri Lankans have a life expectancy of 77.9 years at birth, which is 10% higher than the world average. The infant mortality rate stands at 8.5 per 1,000 births and the maternal mortality rate at 0.39 per 1,000 births, which is on par with figures from the developed countries. The universal "pro-poor" health care system adopted by the country has contributed much towards these figures. Sri Lanka ranks first among southeast Asian countries with respect to deaths by suicide, with 33 deaths per 100,000 persons. According to the Department of Census and Statistics, poverty, destructive pastimes, and inability to cope with stressful situations are the main causes behind the high suicide rates.