Year	current US$
1970	9810000.07875264
1971	10000000.1862645
1972	9450000.07934868
1973	8809999.98003244
1974	15639999.743551
1975	20619999.8613447
1976	21829999.9777228
1977	29909999.9759346
1978	34219999.8944998
1979	47409999.6555597
1980	57759999.9755621
1981	61349999.5321035
1982	60250000.0298023
1983	70560000.3190339
1984	77910000.6222725
1985	101690000.02741799
1986	112209998.819977
1987	129929999.59364499
1988	139570000.53674
1989	181420001.782477
1990	215440000.593662
1991	226310000.211
1992	296770000.636578
1993	305949998.08072996
1994	328659999.191761
1995	310100000.08344704
1996	284119998.95982397
1997	162939999.658614
1998	148909999.806434
1999	153089999.433607
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