their birthrate drop is literally because of feminism and forced gender equality laws that was imposed on them after ww2. https://ibb.co/rssVdY5

edit: i wanted to add i just found out the reason for their second drop after 1970's. The first drop is cause of gender equality laws but the second drop is actually around the time they started using "Stevia" for sweeteners which is literally a sterilant and this seems to have been scrubbed from public consciousness

their birthrate drop is literally because of feminism and forced gender equality laws that was imposed on them after ww2. https://ibb.co/rssVdY5