1. US - 10.9 trillion
6. Italy - 1.47 trillion
7. China - 1.41 trillion
12. India - 0.60 trillion
US leads by at least 10 to 1. Even the Chinese economists don't think they're going to catch up this century.
These figures dont explain reality because they are based on severely depressed currencies of Asia. The currency revaluation going on right now where the US$ is falling will continue and will increase the purchasing power of Asian countries enormously. Thus ppp model is a better indicator.