Year	constant 2021 US$
1973	50000.0007450581
1974	17750000
1975	9859999.65667725
1976	13569999.6948242
1977	20780000.6866455
1978	12890000.3433228
1979	10430000.3051758
1980	14329999.923706101
1981	23739999.7711182
1982	12930000.3051758
1983	8920000.07629395
1984	6360000.1335144
1985	7409999.84741211
1986	11380000.1144409
1987	11689999.5803833
1988	16329999.923706101
1989	8000000
1990	7610000.1335144
1991	11279999.7329712
1992	7420000.07629395
1993	4980000.01907349
1994	6469999.79019165
1995	3130000.1144409203
1996	5360000.1335144
1997	6260000.228881841
1998	13130000.1144409
1999	12149999.6185303
2000	14460000.038146999
2001	11729999.5422363
2002	16659999.847412098
2003	6639999.8664856
2004	1950000.04768372
2005	8640000.34332275
2006	3529999.97138977
2007	5309999.94277954
2008	5599999.90463257
2009	4449999.80926514
2010	18930000.3051758
2011	12850000.3814697
2012	1940000.0572204601
2013	1600000.02384186
2014	2569999.9332428
2015	1649999.97615814
2016	-529999.971389771
2017	11350000.3814697
2018	18780000.6866455
2019	29889999.3896484
2020	27590000.1525879
2021	6139999.8664856