Rather than income, poverty is also measured through individual basic needs at a time. Life expectancy has greatly increased in the developing world since World War II and is starting to close the gap to the developed world. Child mortality has decreased in every developing region of the world. The proportion of the world's population living in countries where the daily per-capita supply of food energy is less than decreased from 56% in the mid-1960s to below 10% by the 1990s. Similar trends can be observed for literacy, access to clean water and electricity and basic consumer items.