This country creates ridiculously high amount of content for its size.
I mean it has over 120 million people which is huge but still the amount of shit they put out is insane.
They alone made 60% of all animation in the world. On top of that they have infinite amount of manga, video games, visual novels, regular novels, light novels, music, porn and live action stuff. When you actually dive into untranslated stuff you realize that Japanese are by far the most profilic in the world. Nobody comes close. Qualily is debatable