When I look at the chart, I think, 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.