It comes from this document published by JETRO (Japan External Trade Organization) where it says (page 7):
International sales data is not exact, but around 60% of the anime shown worldwide is
made in Japan, according to a METI report issued in January 2004. Twenty Japanese anime programs
were being broadcast on American TV as of March 2003.
(Note that "anime" in this context probably means "animation")
The 60% figure was also quoted by Jim Frederick's article in Time Asia "What's Right with Japan":
Pokémon has supplanted Astroboy in the hearts of schoolkids in more than 65 countries, and 60% of the world's animated-cartoon series are made in Japan.
Though, no source was provided.
The number of voice-acting schools was attributed to:
Terumitsu Otsu and Mary Kennard (April 27, 2002). "The art of voice acting". The Daily Yomiuri. p. 11.
Source fetched from the Voice Acting in Japan wikipedia page.
I don't know how to account for the other 40% of animated entertainment. Maybe if you're able to get a copy of the METI report that was issued in January 2004, which doesn't seem to be listed on their website.