2.2 billion people lived on less than US $2 a day in 2011
"Even if the current rate of progress is to be maintained, some 1 billion people will still live in extreme poverty in 2015—and progress has been slower at higher poverty lines. In all, 2.2 billion people lived on less than US $2 a day in 2011, the average poverty line in developing countries and another common measurement of deep deprivation. That is only a slight decline from 2.59 billion in 1981."
Source:https:“Poverty Overview,” Poverty, Topics, The World Bank, last updated October 7, 2014, accessed January 28, 2015, http://www.worldbank.org/en/topic/poverty/overview.