Year	current US$
1977	30344000
1978	36181000
1979	46327000
1980	57098888.91
1981	58024074.1
1982	64824444.470000006
1983	70242592.61999999
1984	20714596.47
1985	27741046.5
1986	86974814.83
1987	97830370.36999999
1988	121937163
1989	127345227.8
1990	135630000
1991	138359259.29999998
1992	124474444.39999999
1993	134763075.2
1994	129866049.6
1995	135381821.9
1996	145112781.89999998
1997	172126883.70000002
1998	192154877
1999	200762101.9
2000	161492763
2001	171828140
2002	178487840
2003	201093125
2004	225224127
2005	240532207
2006	272757822
2007	328338912
2008	375430302
2009	335192507
2010	381578557
2011	386399322
2012	406412797
2013	373397628
2014	362860331
2015	335239917
2016	336492832
2017	331022830
2018	354697583
2019	339279545
2020	317160734