I am guessing 0%
Last heard books recounting the Rape of Nanking were still banned in Japan.
My daughter was watching some movie in school about Hiroshima and Nagasaki. Lots of conversations with older Japanese that had survived.
They did a segment talking with high school students and asking them about the dates the bombs were dropped, what significant things ended the war, etc. Most of them had no clue. I had previously told them about how the Japanese didn’t talk about their brutality, but I was surprised they didn’t teach about the atomic bombs. Perhaps that was a loss of face for them. Or perhaps discussions on the entire war is pretty much stifled as it portrays Japan poorly (their crimes, their loss, etc.)