[T]he chart above could perhaps qualify as the "chart of the century" because it illustrates one of the most remarkable achievements in human history: the 80% reduction in world poverty in only 36 years, from 26.8% of the world's population living on $1 or less (in 1987 dollars) in 1970 to only 5.4% in 2006. (Source: The 2009 NBER working paper "Parametric Estimations of the World Distribution of Income," by economists Maxim Pinkovskiy (MIT) and Xavier Sala-i-Martin (Columbia University).