Big drop of china birthrate
In China there is a fifteen percent less children born than in 2020 by this time. It is mostly because of the one-child policy. People can not really have more than one child, because it is really expensive. The one-child policy was applied in 2016. In 2017 fifty percent of couples with one child didnt even want to have second child, after these four years the percentage in 2020 would be probably even lower. The other factor is that it starts to become less popular to get marriage. In 2019 the marriage rate hit a 14-year-low. Source: https://www.theguardian.com/world/2021/feb/10/china-birthrate-slumps-experts-blame-changing-attitudes