This morning, I've been learning about DXing in Japan, presented by Toshimichi Ohtaké and Sakaé Obara of the Japan Shortwave Club (JSWC). [I blockcopied their names from another page to get the accents & spelling right, but it's probably going to be messed up]. Sakae has a blog that's worth checking out for general shortwave-listening information. Some fascinating information. For example, Radio Australia received 20,000 letters per month from Japan alone in 1973.
Sakae said that although shortwave listening in Japan has dropped off significantly since the radio explosion of the '70s, Baby Boomers are getting back into the hobby. He also said that more young listeners are getting involved.