I think that both Japan and America have been making hits at the same rate.
This is something I want to see, as in visual representation.
Here's what I propose. We do this in vertical bar-graph style. This is kind of complicated, because we have to deal with bias, but what we need is to scour gaming publications all the way back to the days of the NES, and compare US and Japanese games, console ONLY, all the way until present day.
A hit would be considered as a game that receives the publication's highest honor (eg: 5 stars, 100% 10/10, etc...). We would only use games that came out in both US AND Japan, however I'm not to sure as this is kind of biased for Japan.
I dunno, if we could figure some way to do this, this could be REALLY cool. Too much time and effort for anyone here, unfortunately (Yes, including me
).