เมื่อฉันมองดูกราฟ That sounds right, that the economy and need for women to enter the workforce causes a decline in the number of children they have especially that age group, coupled with the fact that many women may wait until later in age to have kids because they're working right? Makes sense, so they end up with only one child
Not infertility issues tho, cause they having kids young, they only have one because they're having to work