Year	constant 2015 US$
1960	200000
1961	1660000
1962	27740000
1963	46520000
1964	133270000
1965	112290000
1966	169830000
1967	130160000
1968	140110000
1969	107230000
1970	95530000
1971	100340000
1972	118050000
1973	115190000
1974	152390000
1975	183190000
1976	240760000
1977	145810000
1978	210740000
1979	203940000
1980	183810000
1981	179040000
1982	212850000
1983	257230000
1984	252380000
1985	182070000
1986	203170000
1987	220790000
1988	134690000
1989	143980000
1990	288540000
1991	177110000
1992	142880000
1993	158820000
1994	457030000
1995	143550000
1996	515770000
1997	341620000
1998	82960000
1999	193930000
2000	47280000
2001	105520000
2002	80230000
2003	81640000
2004	123420000
2005	1459450000
2006	259340000
2007	109190000
2008	404610000
2009	247520000
2010	1173930000
2011	223900000
2012	127220000
2013	133570000
2014	93160000
2015	88800000
2016	87840000
2017	105890000