Number of international graduate students coming to the US had been growing at a slower pace as compared to number of undergraduate students. Here is the data snapshot of leading markets by test-taker volume for GRE and GMAT. It is sorted by top markets for GRE test-takers.
The chart suggests that China is the most important international market for GMAC, while India is most important for GRE. At the same time, it shows opportunities of growth for GRE in China, especially for business programs. Iranians are mostly taking GRE for non-business programs and have shown significant increase in recent years. Taiwan is primarily a GMAT market, again indicating opportunities for GRE for business programs.