In terms of percentages, exceptionally few businesses outside of the EU will implement GDPR. The rest of the world will overwhelmingly entirely ignore it.
There are 20 million businesses in the US. 500,000 new businesses are created each year. 0.1% or less will comply with GDPR. Why? Because very few US businesses ever do business with the EU.
A small clothing retail shop from Texas or Florida or Michigan is not going to concern itself with complying with GDPR just because they took three orders from the EU. They're going to ignore GDPR and continue doing business as they always have. And the EU is going to find it entirely impossible to enforce compliance for those types of small instances due to the scale & tracking required to do so. If by chance they develop a larger EU business, then they'll comply.
Further, how do you force compliance on a US clothing shop from Florida, that sells 27 items per year into the EU, and violates GDPR (while having zero presence in the EU)? They can't, unless the EU develops a Chinese firewall.
The extremely majority of small businesses in India and China also do not do business with the EU. They will not be worried about GDPR. That's true about nearly all the rest of the businesses around the globe.