Year	current US$
1981	12370023964.35285
1982	12413802190.866512
1983	11949298671.063072
1984	9582054375.104948
1985	7305128551.407289
1986	7166766462.521758
1987	8889913247.8513
1988	10200960415.839542
1989	11414468830.409872
1990	11363924483.659323
1991	10252576814.865572
1992	11111505003.117687
1993	11002223401.596514
1994	13616986897.19454
1995	15356848003.110458
1996	17336609354.55693
1997	16741922592.973661
1998	11230162421.24273
1999	13563024405.111794
2000	14407463985.201025
2001	12908191584.661303
2002	14016680445.752897
2003	14417266759.223091
2004	16396779508.078142
2005	18455755333.90897
2006	22538040492.16482
2007	28875155328.817425
2008	32691965291.473866
2009	29887872129.112926
2010	41855376422.22296
2011	42521948137.81325
2012	43617287646.971695
2013	48752595727.97885
2014	54037312901.31351
2015	50917422560.87752
2016	51580754011.83649
2017	54182850987.982635
2018	53463578182.362305
2019	53982990449.24178
2020	34979517410.25166
2021	36099179173.07944
2022	36517076617.24725
2023	40357097105.406265