Year	current US$
2009	37327286540.30878
2010	40855254689.967316
2011	45905091453.20405
2012	43400588178.07462
2013	42813083292.572754
2014	41266334985.3286
2015	36513874990.325485
2016	35959985010.688774
2017	39267314475.663795
2018	42241335987.236725
2019	40819052486.081764