Same here. For people I know well enough to know their bathroom habits, a daily shower/bath is as ritualistic as brushing their teeth.My impression was that most Japanese take a quick shower and then a bath every single evening. Any Japanese family I was close too that was the way. But my personal experience is not a statistic.
Sure we all have if we've walked around Shinjuku or Ueno Koen.I can't help but feel the chart is wrong about Japan somehow. But I have nothing really solid. Its not like I haven't come across some Japanese that didn't seem to bathe much. I have.