Year	current US$
1968	2109999.89509583
1969	2650000.09536743
1970	3339999.91416931
1971	3680000.0667572
1972	3730000.01907349
1973	3619999.8855590797
1974	2789999.96185303
1975	3470000.02861023
1976	2230000.01907349
1977	1909999.9666214
1978	3430000.0667572
1979	4969999.79019165
1980	6139999.8664856
1981	8060000.419616699
1982	8350000.38146973
1983	5860000.1335144
1984	5239999.771118159
1985	5639999.8664856
1986	6340000.15258789
1987	5860000.1335144
1988	5570000.17166138
1989	4550000.19073486
1990	11140000.3433228
1991	13960000.038146999
1992	11350000.3814697
1993	9789999.96185303
1994	9600000.38146973
1995	3460000.03814697
1996	1330000.04291534
1997	6530000.20980835
1998	7949999.80926514
1999	5389999.8664856
2000	4880000.11444092
2001	5170000.07629395
2002	4579999.92370605
2003	6280000.20980835
2004	5030000.20980835
2005	5679999.82833862
2006	5079999.92370605
2007	4400000.09536743
2008	9279999.73297119
2009	7849999.90463257
2010	8729999.54223633
2011	7300000.19073486
2012	8154488.5635375995
2013	7582136.1541748
2014	5525385.37979126
2015	4832216.26281738
2016	4953642.84515381
2017	4036472.3205566397
2018	2080392.1222686798
2019	3162904.26254272
2020	3451463.46092224
2021	3352050.54283142
2022	2443938.01689148