The Japanese yen
averaged about 108 to
the dollar in 2004. It
trended upward
toward 120 in the next
several years. On
December 15 it was
trading at 84.317. It
fell to 77.234 after the
disaster, and is
currently at 82.931.
Let's say a cost of 30
billion dollars US as of
April 1 if Mt. Fuji
erupts explosively.