Year	current US$
1990	15650469.5633372
1991	15185000.6344894
1992	13930830.9977358
1993	13037391.3074608
1994	12256718.0181151
1995	10667891.4902532
1996	9721713.45698239
1997	9438766.01627089
1998	10160753.4484603
1999	9816427.13129642
2000	9521118.2603851
2001	9991244.52480554
2002	10141753.7102856
2003	11107547.7678476
2004	13755125.9584763
2005	18257753.029222
2006	23447968.9465271
2007	32180366.7594276
2008	41489156.6389227
2009	37439049.525129
2010	41968322.2948771
2011	42885445.6178463
2012	41350392.880383
2013	41187749.3429543
2014	41189757.8611549
2015	37869001.3853926
2016	37696473.0089874
2017	36925151.1281606
2018	36734026.5184014
2019	37707782.010711
2020	37322263.8334343
2021	38735290.7340725