Year	current US$
1968	600000.023841858
1969	949999.988079071
1970	1710000.03814697
1971	1580000.04291534
1972	1440000.0572204601
1973	1710000.03814697
1974	1580000.04291534
1975	2950000.04768372
1976	3539999.96185303
1977	2980000.01907349
1978	3609999.89509583
1979	4440000.05722046
1980	5210000.03814697
1981	9329999.92370605
1982	6030000.20980835
1983	6280000.20980835
1984	5059999.94277954
1985	8430000.30517578
1986	5289999.96185303
1987	7550000.19073486
1988	10229999.5422363
1989	8970000.26702881
1990	10229999.5422363
1991	10619999.8855591
1992	7809999.94277954
1993	4420000.07629395
1994	3089999.91416931
1995	5070000.17166138
1996	5070000.17166138
1997	10449999.8092651
1998	9739999.77111816
1999	12199999.8092651
2000	5369999.88555908
2001	2720000.02861023
2002	2089999.9141693101
2003	3519999.98092651
2004	5099999.90463257
2005	4039999.96185303
2006	5480000.01907349
2007	5429999.82833862
2008	5929999.82833862
2009	7989999.771118159
2010	7929999.82833862
2011	5920000.07629395
2012	8251913.070678709
2013	8305480.00335693
2014	7862606.04858398
2015	6643069.74411011
2016	6262310.02807617
2017	4999020.09963989
2018	5248611.45019531
2019	6408619.88067627
2020	6830161.57150269
2021	7483870.02944946
2022	6025703.43017578