The rate of population growth has been slowing[0] since 1963, and monotonically so since 1991. The UN's "medium" projection suggests that the total population peak is just over 10 billion, and the low peak is just over 8 billion[1]

[0] http://en.wikipedia.org/wiki/File:World_population_growth_ra... [1] http://esa.un.org/unpd/wpp/Excel-Data/population.htm