Year	constant 2015 US$
1960	150000
1961	39090000
1962	650000
1963	1560000
1964	-450000
1966	63850000
1967	166430000
1968	140000
1969	410000
1970	750000
1971	1080000
1972	1070000
1973	720000
1974	3030000
1975	64350000
1976	221790000
1977	235780000
1978	280840000
1979	337530000
1980	351600000
1981	320560000
1982	491040000
1983	519540000
1984	662000000
1985	743620000
1986	844210000
1987	1155820000
1988	1485620000
1989	1295110000
1990	1404200000
1991	1485560000
1992	1902570000
1993	1658510000
1994	1618530000
1995	1284770000
1996	1093220000
1997	1259250000
1998	1400410000
1999	1098080000
2000	1314060000
2001	1393540000
2002	3111140000
2003	1259260000
2004	1356600000
2005	1361100000
2006	1677620000
2007	1660350000
2008	1775310000
2009	1870300000
2010	1805850000
2011	1827170000
2012	1888160000
2013	2104210000
2014	1897060000
2015	1812740000
2016	1529130000
2017	1746070000