Japan's growth was so strong in the 70s and 80s that they grew way too much. From 1989, Japan's growth is slow and in some years it is of recession. In relative terms Japan is growing slower than any other country. (In the last 15 years)
Yen hit a peak of 80 per dollar. But it had been as low as 600 per dollar before manufacturing boom.
Depends on which base level you compare, Yen is either strong or weak.
