Year	current US$
1988	3313540067.9324584
1989	2717998687.710016
1990	2838485353.9618664
1991	4690415092.536633
1992	5843579160.901219
1993	7941744492.235954
1994	9599127050.175585
1995	11718795528.555569
1996	13690217333.587883
1997	15751867489.444624
1998	17247179005.521946
1999	17391056369.226524
2000	17260364842.454395
2001	17649751243.781094
2002	19152238805.97015
2003	20082918739.63516
2004	21159827992.039803
2005	21497336498.839138
2006	22022709851.40962
2007	24827355014.925373
2008	29118916105.472637
2009	35399582928.68988
2010	38443907042.12272
2011	39927125961.5257
2012	44016799515.75456
2013	46880103080.597015
2014	48095213746.600334
2015	49929337836.81592
2016	51147308774.12936
2017	53027680685.90382
2018	54901519155.55556
2019	51605959131.27413
2020	31712128253.796097
2021	23131941556.784348
2022	20992421948.808086
2023	17937256175.14098