Year	current US$
1970	0
1971	0
1972	69767327.2391476
1973	184899832.522178
1974	235738644.315614
1975	132730490.276174
1976	137159239.392976
1977	138727130.772497
1978	168421840.77902
1979	245498683.334751
1980	310545221.392652
1981	258103421.645128
1982	211938343.27138
1983	257701883.447756
1984	194367604.88988
1985	272096554.566424
1986	269505088.365665
1987	387534621.729567
1988	486895311.036131
1989	427868362.253975
1990	360711759.109713
1991	362280572.090442
1992	353561703.594519
1993	247590816.67167
1994	308937863.521517
1995	368736913.739698
1996	170011656.877422
1997	37492815.6113519
1998	105013559.830043
1999	80823598.4376949
2000	156095893.31059
2001	65174229.5336824
2002	124266108.173533
2003	165969392.543488
2004	365024933.312367
2005	430579701.190749
2006	772717218.878395
2007	703497496.348111
2008	971225369.674083
2009	867531704.666589
2010	1434119967.26623
2011	1550523826.90365
2012	785412531.475212
2013	182907633.369581
2014	85306569.9057711
2015	200494772.728453
2016	411776792.813568
2017	492977904.982657
2018	465704063.30667
2019	504530853.625391
2020	481184798.217845
2021	2333544253.19944