By number of series, how much of the animation industry is made up by anime?
Counting by "number of series" is rather silly. It has its uses (e.g. it can help answer the question "does Japan produce a wider variety of animated television shows than the rest of the world?"), but it is not a particularly good metric for answering the question "does Japan produce more animated television shows than the rest of the world?". 

Anyway, I deem this claim implausible. IMDB lists 1937 TV series tagged with "Animation" from the US from 1960-2015. It lists 2265 TV series with the same search terms from Japan. We get another 557 titles from France; 171 from Germany; and so forth.

While IMDB is probably systematically biased in favor of having more complete data on US shows than Japanese shows, and also does some weird things like listing "Kimba the White Lion" as a US show, I do not think that the numbers we're looking at support the claim that Japan produces 70% of the world's animation by series count. (I would agree that Japan probably does produce at least a plurality of the world's animation by series count, but series count is a lousy metric, so.)

Incidentally, there's also a very nice whitepaper by the MLIT that I happened upon that doesn't answer this exact question but otherwise has very nice data about the anime industry.