Year	current US$
1974	4881500.721
1975	6065896.988
1976	5812919.617
1977	8156962.394999999
1978	10937007.9
1979	10069497.11
1980	9191613.197
1981	8317034.721000001
1982	7781349.182
1983	8287277.222
1984	8124375.343
1985	7389881.611
1986	11071136.47
1987	12341260.91
1988	13644533.16
1989	12824117.66
1990	13428104.4106681
1991	12654776.9250818
1992	16245308.6488007
1993	6049528.16514334
1994	4075974.17260204
1995	4900346.01548281
1996	6800866.9182681
1997	10391156.8557135
1998	6053037.13616076
1999	6054905.40168344
2000	6727752.27493249
2001	5295765.45100828
2002	17030417.3564083
2003	28325862.1980847
2004	34292108.5007782
2005	35415275.172048
2006	38667705.0997514
2007	47217734.830598
2008	57860981.1718794
2009	72291038.5572626
2010	62850365.039172
2011	92356768.0088219
2012	153251451.616267
2013	177984148.632779
2014	153994596.939353
2015	89431613.8935363
2016	77823097.616674
2017	86322608.0099445
2018	98184891.0465106
2019	102310758.206462
2020	100728931.475861