Year	current US$
1990	5124870779.34604
1991	7730172194.37014
2005	26308301762.3796
2006	32223377605.5378
2007	42281052800.2693
2008	54840886565.9791
2009	36450935591.2446
2010	47753766126.171
2011	54178319766.5601
2012	58909119137.3234
2013	55610936380.4923
2014	50691572867.8831
2015	32942554475.789
2016	35355666547.7893
2017	36688335913.902
2018	35099851987.8837
2019	31081026973.1775
2020	19749419221.0293
2021	24564420029.023