All you said is fine if not for the fact the survey in question wasn't conducted exclusively on international students. The numbers in the survey include both domestic and international students. So yes, an English speaking country with schools requesting GMAT for domestic students will get a higher ranking, which doesn't necessarily mean they're more popular as a business education destination.
Don't troll plz.
1.) GMAT/GMAC are the most respected and acceptable in the world.
2.) GMAT/GMAC are the biggest in the world in terms of quantity as well as quality.
3.) In whole of the world the biggest number majority of people done MBA in English.
4.) To understand that anyone need not to survey bhutani/nepali/japani/chini/french etc.