Year	current US$
1990	37784203.7065977
1991	43203933.7073437
1992	44999868.9112804
1993	50280668.7589578
1994	54446111.8711638
1995	59563508.2380153
1996	60752455.1440984
1997	58722112.4049807
1998	42365932.2635807
1999	45576186.8317199
2000	51755653.3601602
2001	50459830.4626941
2002	44679015.0497131
2003	47906428.4262608
2004	51661852.1082645
2005	54203421.9124539
2006	61384055.4020704
2007	67882949.9229644
2008	82346479.4257595
2009	82286505.3731046
2010	93474845.1780284
2011	107804275.41489
2012	118402237.797536
2013	131332675.933901
2014	137815390.003529
2015	142528359.298403
2016	149145349.106514
2017	152636057.867586
2018	156940890.911954
2019	158188935.417625
2020	162404815.765945
2021	158789414.719035