Globally, the growth rate of the human population has been declining since peaking in 1962 and 1963 at 2.20% per annum. In 2009, the estimated annual growth rate was 1.1%.[74] The CIA World Factbook gives the world annual birthrate, mortality rate, and growth rate as 1.915%, 0.812%, and 1.092% respectively[75] The last one hundred years have seen a rapid increase in population due to medical advances and massive increase in agricultural productivity[76] made possible by the Green Revolution.[77][78][79]