Year	current US$
1970	9810000.07875264
1971	10000000.1862645
1972	9450000.07934868
1973	8809999.98003244
1974	15639999.743551
1975	20609999.861568198
1976	21809999.9781698
1977	29889999.976381697
1978	34149999.8942018
1979	47389999.6560067
1980	57589999.973774
1981	61269999.5338917
1982	60190000.0311434
1983	70540000.3194809
1984	77850000.6236136
1985	101630000.028759
1986	112189998.82042399
1987	129889999.594539
1988	139570000.53674
1989	181330001.77890098
1990	215440000.593662
1991	226310000.211
1992	296770000.636578
1993	305949998.08072996
1994	328659999.191761
1995	310100000.08344704
1996	284089998.960495
1997	162889999.657869
1998	148889999.806881
1999	153029999.434948
2000	165770000.249147
2001	181179998.51703602
2002	168239998.728037
2003	192809999.734163
2004	200160001.218319
2005	245050000.011921
2006	293290001.153946
2007	440480001.032352
2008	467269997.596741
2009	455419999.65906096
2010	492119996.78611803
2011	475520002.782345
2012	400195027.917624
2013	464037693.56012297
2014	514802185.23740804
2015	529189052.522182
2016	540600756.704807
2017	549487650.096416
2018	538443729.639053
2019	573628995.537758
2020	546656000.912189
2021	522418000.22125196
2022	506895002.90155435