Year	current US$
1990	3676337816.84298
1991	4174602464.47069
1992	4556055770.01181
1993	5190475170.12932
1994	5667981932.46843
1995	6238220302.68494
1996	5285008011.58222
1997	4788856010.97529
1998	4502353089.87752
1999	5146299062.78253
2000	5165653163.87914
2001	4384943427.7868
2002	3980359688.52611
2003	4107073648.67496
2004	4187040779.34565
2005	4039415556.4534
2006	3676053317.53175
2007	3581618985.96061
2008	3965832843.65389
2009	4232171828.41075
2010	4329161678.09791
2011	4718125993.07082
2012	4741750599.10699
2013	4022216712.8473
2014	3908160663.24197
2015	3534734084.04059
2016	3944649570.03739
2017	3779373201.17066
2018	3901590239.58496
2019	3997459539.50272
2020	4038395612.37363
2021	3804604470.41885