Year	current US$
1970	25097564.5101552
1971	33931458.2426991
1972	41228983.31566
1973	42886668.072422
1974	116833277.849074
1975	318818441.537141
1976	368937968.409694
1977	384279104.372266
1978	352002486.543461
1979	419632062.191329
1980	499854575.365283
1981	620204517.813817
1982	674592848.83292
1983	417380629.133427
1984	278342551.595299
1985	319495691.714179
1986	183407550.476931
1987	105875640.329935
1988	97816670.0183438
1989	117678738.807635
1990	204594389.853241
1991	182138434.064562
1992	128271597.002976
1993	103901832.99254
1994	81787082.6233472
1995	152315515.424555
1996	139849508.22535
1997	130212060.917912
1998	62709568.5821337
1999	43837496.0596559
2000	158260298.505153
2001	310725999.344015
2002	217538761.10371
2003	245294358.252848
2004	563238782.840055
2005	521779758.635289
2006	690433267.605572
2007	742381600.400917
2008	1842879225.31281
2009	761997309.966753
2010	1005652796.3404
2011	1401009382.26449
2012	991517914.333525
2013	875610172.874894
2014	696040048.603396
2015	458422088.202391
2016	362340926.511452
2017	498851090.325641
2018	688512766.245542
2019	522724260.891408
2020	300436839.06177
2021	942786341.291252