Year	current US$
1977	6109999.91372228
1979	0
1980	12510000.087320799
1981	9759999.9755621
1982	8219999.998807911
1983	8449999.90053475
1984	7680000.08538365
1985	8520000.01817942
1986	6539999.93763864
1987	5999999.84540045
1988	8120000.001043079
1989	13550000.3024936
1990	8860000.06645918
1991	8490000.03002584
1992	6990000.06727874
1993	9890000.03039837
1994	16729999.938979698
1995	24080000.0932068
1996	21939999.7852743
1997	17650000.0599772
1998	19069999.9034405
1999	14709999.918937702
2000	10940000.0572205
2001	18490000.2479553
2002	17260000.0500679
2003	16909999.9070168
2004	15870000.0941753
2005	12529999.911785102
2006	16020000.0107288
2007	14290000.081062298
2008	15980000.1084805
2009	21279999.9713898
2010	19840000.1078844
2011	20889999.7472763
2012	23500002.0861626
2013	24497522.175312
2014	24799820.7807541
2015	22089200.9735107
2016	17364684.373140298
2017	14629961.4310265
2018	17012259.9005699
2019	28227501.6307831
2020	29853860.0206375
2021	32774551.2127876
2022	29297589.600086212