Year	current US$
1970	14969999.818131316
1971	15629999.943077553
1972	23250000.5364418
1973	22570000.171661355
1974	29770000.21934509
1975	22949999.460950483
1976	47740000.48637393
1977	27860000.312328346
1978	28470000.67122281
1979	26279999.33436516
1980	48739999.167621136
1981	30729999.769479036
1982	80729998.1601536
1983	55730000.883340836
1984	50880000.20571051
1985	47789999.8221546
1986	31970000.348985225
1987	57220001.39951704
1988	115270001.84729695
1989	92039999.62285174
1990	95610001.85273589
1991	118600000.47087671
1992	87139998.21245673
1993	67980000.67472452
1994	61930001.3259053
1995	92239998.37040903
1996	142279999.2244692
1997	43959999.315440595
1998	34709999.6656179
1999	32700000.036507804
2000	28269999.98837712
2001	23159999.772906292
2002	35799999.62076543
2003	92350000.93653806
2004	153599997.23173675
2005	471559998.9891053
2006	186010001.6891955
2007	219739998.96645552
2008	361140000.7158518
2009	244750000.59604618
2010	208580000.6687637
2011	200619998.7828731
2012	192169999.77827072
2013	320639998.85320663
2014	327409997.4483253
2015	398160000.3242494
2016	312110000.5470217
2017	453530008.2862375
2018	465490004.71830344
2019	400830004.0066242
2020	416369996.13046646
2021	501220005.1546097
2022	430370006.33776176