Year	current US$
1968	4320000.17166138
1969	3410000.08583069
1970	3849999.90463257
1971	4519999.98092651
1972	4500000
1973	5349999.90463257
1974	5929999.82833862
1975	7039999.96185303
1976	2529999.97138977
1977	8289999.961853029
1978	10869999.8855591
1979	12789999.961853001
1980	13199999.8092651
1981	14239999.7711182
1982	10720000.2670288
1983	8720000.26702881
1984	7320000.17166138
1985	5679999.82833862
1986	6400000.09536743
1987	3849999.90463257
1988	6219999.79019165
1989	6710000.03814697
1990	10479999.5422363
1991	13229999.5422363
1992	10010000.2288818
1993	9189999.5803833
1994	7139999.8664856
1995	7619999.88555908
1996	23969999.3133545
1997	31520000.4577637
1998	12930000.3051758
1999	3619999.8855590797
2000	6090000.15258789
2001	8640000.34332275
2002	12739999.7711182
2003	4840000.15258789
2004	3500000
2005	8010000.22888184
2006	13869999.8855591
2007	15659999.8474121
2008	14539999.961853001
2009	14829999.923706101
2010	15350000.3814697
2011	11680000.3051758
2012	13843204.498290999
2013	12490157.127380399
2014	11285909.65271
2015	9862656.59332275
2016	9692675.59051514
2017	5244233.60824585
2018	2012087.8219604502
2019	3745582.10372925
2020	4649769.78302002
2021	3736105.44204712
2022	5264262.67623901