Year	constant 2015 US$
1960	195320000
1961	195450000
1962	247150000
1963	167750000
1964	181590000
1965	150810000
1966	176340000
1967	155390000
1968	161670000
1969	187410000
1970	209770000
1971	182980000
1972	214740000
1973	97200000
1974	66390000
1975	179060000
1976	70990000
1977	54570000
1978	106650000
1979	114940000
1980	251380000
1981	309320000
1982	306120000
1983	328260000
1984	403360000
1985	439470000
1986	383600000
1987	509750000
1988	621380000
1989	820870000
1990	936860000
1991	900690000
1992	934740000
1993	823330000
1994	970620000
1995	981560000
1996	810530000
1997	1055450000
1998	863580000
1999	794030000
2000	1183890000
2001	1184530000
2002	996980000
2003	1194980000
2004	1336790000
2005	1283750000
2006	1623440000
2007	1655440000
2008	1504340000
2009	1708320000
2010	1609040000
2011	1428310000
2012	1519260000
2013	1565000000
2014	1497400000
2015	1619390000
2016	1756850000
2017	1976190000