The EU, China and the USA make up 62% of the world economy on a exchange rate (nominal) basis.
The EU, China and the USA make up 49% [with Hong Kong] of the world economy on a PPP (Purchasing Power parity) basis.
India PPP GDP ($8 trillion) is equal to Japan PPP GDP and ASEAN PPP GDP.
However, in terms of Import and Exports Japan is nearly double the level of India.
The PPP GDP of Asia has a PPP GDP of about $50 trillion and PPP GDP of Aaia without China and Hong Kong is about $30 trillion.
Exports between countries makes up about 22% of overall world economy.