http://www.toushin-1.jp/articles/-/2979
https://www.bloomberg.co.jp/news/articles/2017-04-27/OP1PGN6TTDS001
https://m.finance.yahoo.co.jp/fx/news/detail/20170427-00220855-zaifxf-fx
https://m.finance.yahoo.co.jp/fx/news/detail/20170427-00000019-dzh-fx