Year	current US$
1990	22359329.657166
1991	19608367.8561739
1992	17862370.9050764
1993	18935269.7409163
1994	21018016.8211455
1995	23080875.0599433
1996	24755560.5717354
1997	22071777.1407656
1998	17647561.1908916
1999	18411586.6635779
2000	16158628.2602621
2001	16213383.7271655
2002	19637340.6322379
2003	23740499.7660696
2004	26631383.4127966
2005	27729392.9887492
2006	26719743.3667334
2007	33481623.6204321
2008	33017289.1414714
2009	30816661.0472783
2010	37630270.1880179
2011	42717522.520964
2012	42787278.0561108
2013	44692517.7263247
2014	45688069.6663402
2015	37382433.666018
2016	38585154.8692368
2017	41895308.6742775
2018	43199870.7875496
2019	43044455.0540112
2020	44664101.4211591
2021	51574532.1089507