20% of GDP trillions of dollars trillions of dollars ~$15 Trillion in annual revenue trillions of dollars trillions of dollars trillions of dollars trillions of dollars The IMF estimates billioner av dollar 20% to the global gross domestic product; trillions of dollars trillions of dollars trillions of dollars worth $13.1tn in 2014 trillions of dollars trillions of dollars trillions of dollars trillions of dollars 12% to 19.5% of the total global economy