https://www.nikkansports.com/m/battle/news/201812300000830_m.html?mode=all
https://m.finance.yahoo.co.jp/fx/news/detail/20181231-04476691-klugfx-fx&code=USDJPY
https://www.sankei.com/smp/affairs/news/181230/afr1812300002-s1.html
http://news.livedoor.com/lite/article_detail/15816005/