The 38% for Japan seems suspect to me. I found this online from a commercial site, but the number is closer to my experience: "Bidet Toilets and Japanese Culture High-end Japanese-style toilet and bidet combinations might retain a degree of exoticism in the US, but they’re extremely common in Japan. According to NPR, roughly 80% of Japanese households own a bidet, and you’ll find fancy Japanese toilets in most public areas as well. "