The proportion of the developing world's population living in extreme economic poverty fell from 28 percent in 1990 to 21 percent in 2001. Most of this improvement has occurred in East and South Asia. In 2012 it was estimated that, using a poverty line of $1.25 a day, 1.2 billion people lived in poverty. Given the current economic model, built on GDP, it would take 100 years to bring the world's poorest up to the poverty line of $1.25 a day. UNICEF estimates half the world's children (or 1.1 billion) live in poverty. The World Bank forecasted in 2015 that 702.1 million people were living in extreme poverty, down from 1.75 billion in 1990. Extreme poverty is observed in all parts of the world, including developed economies. Of the 2015 population, about 347.1 million people (35.2%) lived in Sub-Saharan Africa and 231.3 million (13.5%) lived in South Asia. According to the World Bank, between 1990 and 2015, the percentage of the world's population living in extreme poverty fell from 37.1% to 9.6%, falling below 10% for the first time. During the 2013 to 2015 period, the World Bank reported that extreme poverty fell from 11% to 10%, however they also noted that the rate of decline had slowed by nearly half from the 25 year average with parts of sub-saharan Africa returning to early 2000 levels. The World Bank attributed this to increasing violence following the Arab Spring, population increases in Sub-Saharan Africa, and general African inflationary pressures and economic malaise were the primary drivers for this slow down. Many wealthy nations have seen an increase in relative poverty rates ever since the Great Recession, in particular among children from impoverished families who often reside in substandard housing and find educational opportunities out of reach. It has been argued by some academics that the neoliberal policies promoted by global financial institutions such as the IMF and the World Bank are actually exacerbating both inequality and poverty.