Year	constant 2015 US$
1960	630000
1961	16540000
1962	81090000
1963	58100000
1964	130890000
1965	157790000
1966	175960000
1967	116350000
1968	189080000
1969	145290000
1970	134670000
1971	167300000
1972	192240000
1973	321010000
1974	467210000
1975	499000000
1976	289110000
1977	338480000
1978	413110000
1979	441970000
1980	579140000
1981	525610000
1982	495680000
1983	519850000
1984	824400000
1985	938860000
1986	746140000
1987	611910000
1988	695690000
1989	716930000
1990	677030000
1991	625380000
1992	561690000
1993	503490000
1994	568150000
1995	613830000
1996	568540000
1997	554750000
1998	453670000
1999	468630000
2000	415980000
2001	510470000
2002	582880000
2003	666590000
2004	638280000
2005	770400000
2006	895590000
2007	949070000
2008	854420000
2009	914340000
2010	1021670000
2011	1131490000
2012	932300000
2013	1238700000
2014	1090660000
2015	1204730000
2016	1207860000
2017	1324870000