"In 2010 about 48 percent of the world population had an average total fertility of less than 2.1 children per woman." (source)Nations have thus been "substantially annihilated" (i.e., what Aristotelians and Thomists call "corruption," a type of change in which the substance of something is lost; cf. St. Thomas's De Principii Naturæ).
All countries aren't equally contracepting themselves to death. Here is the avg. # children per couple per country:
See the documentaries: Demographic Winter & Demographic Bomb, or this new one: