The effect of exchange rate depends on the time frame you consider. From 2000 to 2008, the dollar/yen ratio was between 100 and 120. After 2008, the ratio dropped substantially, bottoming at around 78 in May 2011. Since then it has risen back to 120. The 2008 to 2013 were an anomaly compared to the last 30 years.
Dates of major crossing points.
July 2007 - 120
Oct. 2008 - 100
May 2011 - 90
Oct, 2012 - 78
Jan. 2013 - 90
May 2013 - 100
Nov. 2014 - 110
Current - 120
Data from oanda.com website. You can get historical prices there, graph or table.
Historical Exchange Rates
Dates of major crossing points.
July 2007 - 120
Oct. 2008 - 100
May 2011 - 90
Oct, 2012 - 78
Jan. 2013 - 90
May 2013 - 100
Nov. 2014 - 110
Current - 120
Data from oanda.com website. You can get historical prices there, graph or table.
Historical Exchange Rates