Year	constant 2010 US$
1975	358672470.588235
1976	419320000
1977	432618352.941176
1978	472182117.647059
1979	480288470.588235
1980	490853647.058823
1981	473129411.764706
1982	447764705.882353
1983	459152941.176471
1984	467952941.176471
1985	423435294.117647
1986	445176470.588235
1987	415670588.235294
1988	443623529.411765
1989	467435294.117647
1990	455011764.705882
1991	433788235.294118
1992	401694117.647059
1993	406352941.176471
1994	400658823.529412
1995	421364705.882353
1996	448282352.941176
1997	470023529.411765
1998	378917647.058824
1999	358729411.764706
2000	349929411.764706
2001	315764705.882353
2002	318870588.235294
2003	313694117.647059
2004	320423529.411765
2005	327152941.176471
2006	325082352.941176
2007	321458823.529412
2008	314211764.705882
2009	275905882.352941
2010	264000000
2011	250023529.411765
2012	232941176.470588
2013	238117647.058824
2014	233976470.588235
2015	229317647.058824
2016	226211764.705882