Year	current US$
1981	33703636.36
1982	33764545.45
1983	39352727.27
1984	41656610.1
1985	56843226.6
1986	102709279.5
1987	78012975.97999999
1988	143482763.79999998
1989	120911795.9
1990	145773529
1991	116988078.2
1992	124016111.10000001
1993	119620148.1
1994	94355265.56
1995	108965788.5
1996	79550437.78
1997	62015447.410000004
1998	62166296.3
1999	55644074.07
2000	45434346
2001	45324144
2002	62570628
2003	62696860
2004	79331145
2005	63705116
2006	94130884
2007	53483008
2008	165251157
2009	255802499
2010	216851702
2011	138791553
2012	78171477
2013	140543136
2014	135043757
2015	166232699
2016	105426024
2017	131289403.99999999
2018	114710610
2019	94353010
2020	74945154