Year	current US$
1970	1600000
1971	1600000
1972	1800000
1973	1900000
1974	1900000
1975	2300000
1976	1500000
1977	1800000
1978	1000000
1979	2400000
1980	3800000
1981	2900000
1982	3700000
1983	3100000
1984	2600000
1985	4900000
1986	4491267.42
1987	8726042.008
1988	6573251.322
1989	6753179.579
1990	6904667.281
1991	5287080.965000001
1992	6492516.455999999
1993	12356812.4
1994	6927401.001
1995	12739905.98
1996	16187178.06
1997	13902643.72
1998	10354277.56
1999	11394771.18
2000	14313083
2001	9810204
2002	10611182
2003	12383811
2004	15315174
2005	18291676
2006	21661432
2007	21186405
2008	39071998
2009	38045522
2010	48137694
2011	210712977
2012	104304915
2013	63416942
2014	64990925.00000001
2015	458690837
2016	215687629
2017	61184289
2018	92642750
2019	63900703
2020	58422278