Year	current US$
1990	2544695.78803034
1991	2818035.77200582
1992	3884822.92479216
1993	3505505.87511535
1994	3660921.45251073
1995	4127528.13079814
1996	4456844.65972749
1997	4801269.1367749
1998	5478127.95924108
1999	5857832.47744888
2000	6125331.7151377
2001	6792394.32052387
2002	7859576.86523257
2003	8615281.9055557
2004	8824974.48009792
2005	9539160.87263908
2006	10790467.0273511
2007	11846494.355588
2008	12882114.7582486
2009	38388292.6135539
2010	14003339.1436748
2011	16107329.65551
2012	21749033.6078039
2013	15192931.4049219
2014	16161962.9780733
2015	17038681.6188852
2016	17955777.1417439
2017	18708546.4104007
2018	19981159.904361
2019	21205038.0257731
2020	16819312.6466756
2021	18150850.3434313