At the stage of use, GDP is calculated as the sum of final consumption of goods and services, gross formation and net exports excluding imports.

UNESCO: Belarus: Report: Part I: Descriptive Section

It goes on to say there would be a negative impact on the balance of trade, as England, Wales and Northern Ireland would have to boost imports of oil, rising to 2% of gross domestic product.

BBC: Scottish independence: credit where it's due

India's current account deficit widened to a record 5.4% of gross domestic product in the July-September quarter primarily driven by high oil and gold imports and a sharp slowdown in exports witnessed over the past year.

WSJ: India Exports Rise 4.25%