Meanwhile, the parents (2), grandparents (4) and great-grandparents (8) of those two kids have also died off in the intervening years, plus the same for their spouse/partner's family leaving population growth relatively flat...
"A loosely defined goal of ZPG is to match the replacement fertility rate, which is the average number of children per woman which would hold the population constant. This replacement fertility will depend on mortality rates and the sex ratio at birth, and varies from around 2.1 in developed countries to over 3.0 in some developing countries." (per Princeton Population Research and Policy Review).
Fairly simple math no matter who you voted for in November...