Year	current US$
1970	1500000
1971	1300000
1972	1500000
1973	2000000
1974	2600000
1975	2000000
1976	1700000
1977	9600000
1978	12900000
1979	16800000
1980	15900000
1981	16800000
1982	14000000
1983	19200000
1984	25200000
1985	27300000
1986	17700000
1987	20600000
1988	73378246.03
1989	117085212.4
1990	13640877.66
1991	16486087.5
1992	18144123.64
1993	15274629.08
1994	23832166.740000002
1995	24576552.56
1996	167062934.5
1997	68418234.67999999
1998	90323581.89999999
1999	108112492.39999999
2000	183077090
2001	152905844
2002	285265346
2003	330525405
2004	292801410
2005	321249208
2006	362555487
2007	368664748
2008	458180069
2009	468639023
2010	423345472
2011	971322929
2012	659779773
2013	579704520
2014	555643032
2015	476458510
2016	485554087
2017	594193144
2018	764656455
2019	710071560
2020	758380343