That’s a very misleading graph. If the “Y” axis extended down to zero, we’d be looking at a much less dramatic picture.
Heck, I remember when the U.S. dollar was actually considered currency back in the 80’s. While stationed in Japan, it was 200+ yen per $1.00 (U.S). 76 yen/dollar just tells me how much our currency has been devalued since then.