https://www.japantimes.co.jp/news/2018/12/21/national/number-babies-born-japan-2018-lowest-since-records-began-population-decline-highest
http://rotter.net/forum/scoops1/223960.shtml
https://www.npr.org/2019/12/24/791132555/japans-births-decline-to-lowest-number-on-record