Year	constant 2010 US$
1975	81782647.0588234
1976	87681176.4705881
1977	89421705.8823528
1978	89369823.5294117
1979	96730941.1764705
1980	102014294.117647
1981	84494117.6470587
1982	82394117.6470587
1983	85605882.3529411
1984	93635294.117647
1985	93141176.4705881
1986	97341176.4705881
1987	86470588.235294
1988	81405882.3529411
1989	74117647.0588235
1990	79429411.7647058
1991	76711764.7058823
1992	69300000
1993	66088235.2941176
1994	65964705.8823529
1995	65717647.0588235
1996	77329411.7647058
1997	76835294.117647
1998	66582352.9411764
1999	72882352.9411764
2000	75600000
2001	68435294.1176471
2002	65594117.6470588
2003	63000000
2004	58429411.7647059
2005	63123529.4117647
2006	59541176.4705882
2007	60900000
2008	60900000
2009	62629411.7647059
2010	58800000
2011	55094117.6470588
2012	56576470.5882353
2013	58182352.9411765
2014	55958823.5294118
2015	54229411.7647059
2016	53117647.0588235