Year	constant 2015 US$
1966	42870000
1967	62860000
1968	60320000
1969	64110000
1970	72810000
1971	61520000
1972	66170000
1973	78860000
1974	113950000
1975	105510000
1976	86670000
1977	137600000
1978	274600000
1979	50760000
1980	152540000
1981	144370000
1982	136680000
1983	156320000
1984	252690000
1985	200180000
1986	222330000
1987	172610000
1988	144170000
1989	118970000
1990	285250000
1991	140530000
1992	138400000
1993	181050000
1994	157650000
1995	109870000
1996	107000000
1997	105790000
1998	100280000
1999	95360000
2000	95910000
2001	85900000
2002	100440000
2003	92420000
2004	68640000
2005	77790000
2006	117010000
2007	105010000
2008	124660000
2009	148410000
2010	117780000
2011	122150000
2012	131010000
2013	130610000
2014	148550000
2015	172150000
2016	187160000
2017	132490000