Year	current US$
1990	44216214.961769
1991	42111061.8007077
1992	39005676.4368822
1993	39020089.4930295
1994	40544170.0902852
1995	36699674.9800942
1996	31834164.6916535
1997	25817356.0603514
1998	22594455.5608395
1999	16349256.0508175
2000	16552092.9442314
2001	16362387.6929008
2002	16752084.199603
2003	17860410.4532216
2004	17739749.1135188
2005	19842901.5357667
2006	23604264.403573
2007	28632081.7747612
2008	33151457.6715954
2009	28159045.4860756
2010	28936962.6044606
2011	33799269.1662238
2012	35013581.2190914
2013	34232323.0283119
2014	32788687.4332355
2015	28724173.6093136
2016	27437872.5689818
2017	29289409.5806331
2018	31526586.3180363
2019	32995493.8162627
2020	31612201.4760428
2021	33279116.3792763