Year	current US$
1970	23399999.910965547
1971	45569999.6184557
1972	55090000.43012197
1973	50210000.449791566
1974	71080000.21800408
1975	90610000.25644895
1976	81469999.88704917
1977	66380000.16845761
1978	77550000.92461711
1979	95080000.01497567
1980	73710000.77947967
1981	76669999.51750049
1982	70999999.27729367
1983	77110001.28462906
1984	143829999.68901274
1985	132340001.13606447
1986	116930000.42438507
1987	145080001.20520592
1988	151200001.2975185
1989	185590000.94607472
1990	163370000.19848347
1991	175680003.3301114
1992	170380001.39594084
1993	126979997.31451273
1994	101329998.96258113
1995	128109998.98612511
1996	133599998.72744086
1997	92090000.39100647
1998	157190001.47283068
1999	114819999.98912215
2000	81759998.94738197
2001	64849999.6513128
2002	243480003.86357313
2003	155090000.97215182
2004	236919998.92890444
2005	283269998.7888336
2006	382510003.07500416
2007	309859996.49763113
2008	369690001.63674355
2009	394500005.48362744
2010	480729997.39274365
2011	387330001.5777346
2012	532730006.54205656
2013	362610002.093017
2014	390040000.83357084
2015	358029996.5143204
2016	292930006.6176801
2017	343649996.85063964
2018	425980001.7103553
2019	310970000.34153473