Abortions have reduced the U.S. population by 19%
https://nrlc.org/uploads/factsheets/FS01AbortionintheUS.pdf
The population of the U.S. is 332,403,650 according to the U.S. Census.
The number of abortions divided by the U.S. population is 19 percent.
The sources are the:
U.S. Census
National Right to Life