I think it's *generally speaking* a global trend but you'll only get figures from countries where it is legal - even then you can't know the true figures.  It's usually an estimate. Where it is illegal or a "grey area" there either won't be figures or they will be wildly inaccurate. 

justanumber

charts

Over 3 Million Americans are Homeschooled

It's surprising and it would be interesting to have explanations for such a phenomenon which tends to intensify in America. It would also be to compare it with other countries around the world to see if it's a global trend, or just localizing to America.