Still, the Pew Research Center said that from 2001 to
2011 the world "witnessed an historic reduction in
global poverty," with those considered "middle
income" nearly doubling. By 2011, only 15 percent of
the world's population lived on less than $2 a day..."
http://www.ticotimes.net/2015/07/08/millions-exit-poverty-worldwide-but-just-barely-study