The US dollar topped 100 yen for the first time in more than four years on Thursday as Tokyo's aggressive stimulus efforts to reflate the Japanese economy continue to depress its currency.
The dollar at 1410 GMT was trading at 100.67 yen, up from 99.01 late Wednesday and below 78 yen in late September 2012. The dollar last traded above 100 yen in April 2009.
