Year	current US$
1990	34909349.425856
1991	36399535.8017317
1992	19649372.3455212
1993	22687119.879798
1994	30075992.9387401
1995	39141491.4182778
1996	37736948.3099468
1997	31626543.1369931
1998	31223473.8525438
1999	30054643.722914
2000	27080835.3247573
2001	27109105.8588587
2002	28973263.5350252
2003	33991012.5267402
2004	34136892.8119773
2005	34119020.6491406
2006	36596315.8073948
2007	40474712.0081119
2008	45457237.6023068
2009	44484875.758718
2010	42865426.4251947
2011	44304557.5333893
2012	41123482.1849604
2013	41406433.3551578
2014	41116770.593837
2015	35263099.5404763
2016	37457809.8047181
2017	36624162.352428
2018	42651830.4540754
2019	38050805.5905101
2020	38544828.7489426
2021	40282377.5333748