[throwaway384028]

As much as I want to trust a guy on twitter who made some graphs on excel, according to the journal of endocrinology their is a decline: https://academic.oup.com/jcem/article/92/1/196/2598434

Plastics might not be the only factor, I believe a lot of it has to do with lifestyle of average americans as well (obesity, sedentary, high sugar and fat diets) though I do think that plastics play a part as well.