Year	constant 2015 US$
1961	29620000
1966	23130000
1967	6560000
1969	80000
1975	29670000
1976	80760000
1977	77860000
1978	93100000
1979	72550000
1980	130090000
1981	112830000
1982	120690000
1983	136860000
1984	159800000
1985	163990000
1986	212250000
1987	142570000
1988	128750000
1989	142480000
1990	154730000
1991	144810000
1992	149820000
1993	157110000
1994	159960000
1995	136740000
1996	141160000
1997	148890000
1998	176770000
1999	183540000
2000	138940000
2001	117690000
2002	130070000
2003	173860000
2004	157180000
2005	174060000
2006	142060000
2007	152730000
2008	194540000
2009	178380000
2010	298660000
2011	211320000
2012	222430000
2013	214280000
2014	202520000
2015	155320000
2016	113360000
2017	120140000