The Gross Domestic Product (GDP) is usually :
GDP = Private Expenditure + Govt Expenditure + Investments + (Exports Minus Imports->Net Exports).
How has India done, at a component level, over the last sixty years?
And to see how important trade has been for us:
Look at the huge increase in both directions post liberalization. And the last five years have seen a levelling off, if you may, in terms of % of GDP (the actual numbers have grown, of course).