Year	current US$
2009	40177802192.74398
2010	43924742220.05227
2011	49103928243.01366
2012	46428152673.87547
2013	45598857078.23834
2014	44854643792.81599
2015	39860864790.63411
2016	39383672398.352455
2017	43319081790.40581
2018	46967957307.76502
2019	46083510409.29411