Year	current US$
1968	28850000.143051103
1969	15980000.156909201
1970	18930000.122636598
1971	19810000.218450997
1972	18849999.7612089
1973	19110000.2024323
1974	22320000.2759695
1975	34259999.1559982
1976	34430000.1561642
1977	46530000.1502037
1978	61940000.8320808
1979	77239999.294281
1980	80280001.282692
1981	90020000.5173683
1982	97520000.21934511
1983	85350000.500679
1984	93309998.2738495
1985	97689999.9976158
1986	110250000.47683701
1987	108579999.566078
1988	108920000.731945
1989	118039999.127388
1990	115159999.132156
1991	117060000.896454
1992	113350002.527237
1993	109320003.628731
1994	91639998.1975555
1995	63370000.8392334
1996	60529999.7925758
1997	70969999.37295909
1998	69569999.9928474
1999	66910000.532865494
2000	66159999.1321564
2001	53140001.0585785
2002	60710001.2004375
2003	53939999.9380112
2004	65039999.78303909
2005	62150000.4529953
2006	60400000.3933907
2007	70739999.6519089
2008	58519999.8021126
2009	82799998.87943271
2010	77180001.55687329
2011	70130000.1144409
2012	65007560.8491898
2013	54953528.7618637
2014	52971589.684486404
2015	48261535.346508
2016	34790029.1979313
2017	31365252.733230602
2018	21343017.5185204
2019	27230090.8267498
2020	25901385.5755329
2021	31720873.4750748
2022	37892741.620540634