Year	current US$
1970	5613301.74407768
1971	7976861.80137603
1972	9821415.62782916
1973	10859509.368021
1974	9563930.08196471
1975	7253671.11673217
1976	26763715.0321518
1977	23806735.3029472
1978	26047176.6597562
1979	52197638.0025133
1980	57235668.2438643
1981	47656641.066613
1982	34566237.2680494
1983	32561295.6775769
1984	33085546.4898502
1985	35417969.6353523
1986	35432946.0808975
1987	34768708.393465
1988	53386648.3789685
1989	77480806.9548021
1990	94234185.6979735
1991	56235801.9742319
1992	23197691.2175102
1993	22033640.3390352
1994	46814668.7452862
1995	45355119.8180973
1996	64972298.1469164
1997	50996319.2637984
1998	33729312.0206329
1999	29431426.7309169
2000	21328553.8819199
2001	29671077.0238577
2002	59060157.9896863
2003	98684380.1370589
2004	85910556.6912553
2005	95105528.9715789
2006	143732223.291849
2007	214869329.043713
2008	254006233.279719
2009	160766019.920277
2010	191676218.291111
2011	207673765.175374
2012	171555586.82743
2013	174546665.626236
2014	178656221.2339
2015	153991791.594263
2016	137795648.874219
2017	137130840.505089
2018	202829446.249898
2019	147705038.444623
2020	99977624.6553876
2021	140279219.514671