https://forbesjapan.com/articles/detail/26610/1/1/1
https://www.sankei.com/smp/affairs/news/190411/afr1904110049-s1.html
https://jp.reuters.com/article/tokyo-fx-lateaft-idJPKCN1RN0GZ
https://www.bloomberg.co.jp/news/articles/2019-04-11/PPS3X56K50XS01