Year	current US$
1970	25909999.96662141
1971	32360000.01430511
1972	39870000.36239621
1973	37180000.1859665
1974	31590000.033378597
1975	44370000.42200088
1976	36719999.79019166
1977	35089999.64594841
1978	41539999.95067716
1979	47420000.91448427
1980	51799999.92251393
1981	59270001.35183334
1982	53850000.33676624
1983	45490000.2479553
1984	34850000.0834465
1985	30859999.77588653
1986	38339999.72045422
1987	34929999.82833862
1988	44619999.88555909
1989	50639999.9260903
1990	48840000.12278554
1991	38899999.6781349
1992	35559999.55534935
1993	27930000.057444
1994	21859999.835491188
1995	19419999.837875362
1996	21190000.116825104
1997	33819999.75442886
1998	34109999.29904939
1999	690000.8916855222
2000	15990000.054240238
2001	13999999.940395355
2002	13079999.804496773
2003	12880000.26345253
2004	17490000.30755998
2005	13819999.992847446
2006	14939999.997615814
2007	15030000.26941299
2008	18740000.158548363
2009	19439999.93801117
2010	21219999.894499768
2011	19990000.218153
2012	15888749.793171879
2013	21344924.39031601
2014	14790538.504719751
2015	13956224.501132969
2016	8314963.206648827
2017	6920410.715043541
2018	5041214.823722837
2019	7627469.703555108
2020	9836482.673883438
2021	11673981.696367256
2022	20972586.035728455