Year	current US$
1971	949999.988079071
1972	2589999.91416931
1973	3769999.98092651
1974	6250000
1975	12020000.4577637
1976	12340000.1525879
1977	8869999.88555908
1978	9869999.88555908
1979	13229999.5422363
1980	17649999.6185303
1981	16010000.2288818
1982	14810000.4196167
1983	18770000.4577637
1984	21139999.3896484
1985	16620000.839233398
1986	28920000.0762939
1987	34180000.3051758
1988	67220001.2207031
1989	55360000.6103516
1990	50979999.5422363
1991	40580001.8310547
1992	34909999.8474121
1993	15739999.7711182
1994	22520000.4577637
1995	9359999.65667725
1996	9039999.96185303
1997	10000000
1998	11920000.076293899
1999	10619999.8855591
2000	12430000.3051758
2001	12899999.6185303
2002	12609999.6566772
2003	13170000.076293899
2004	14840000.1525879
2005	17159999.8474121
2006	30670000.0762939
2007	36650001.5258789
2008	42790000.9155273
2009	55650001.5258789
2010	47919998.1689453
2011	54540000.9155273
2012	35020000.4577637
2013	45240001.6784668
2014	54220001.220703095
2015	29040000.915527303
2016	22079999.9237061
2017	16760000.2288818
2018	14680000.3051758
2019	13170000.076293899
2020	15710000.038146999
2021	20739999.7711182
2022	17489999.7711182