Year	constant 2015 US$
1960	372180000
1961	216190000
1962	309450000
1963	404050000
1964	203370000
1965	151750000
1966	142000000
1967	102800000
1968	124650000
1969	204920000
1970	153870000
1971	262110000
1972	244460000
1973	312000000
1974	262470000
1975	206760000
1976	241220000
1977	311980000
1978	682040000
1979	831140000
1980	675230000
1981	616740000
1982	738860000
1983	690410000
1984	623290000
1985	805390000
1986	674670000
1987	524110000
1988	570750000
1989	246130000
1990	215430000
1991	220140000
1992	128340000
1993	103530000
1994	152710000
1995	128960000
1996	36290000
1997	58570000
1998	97690000
1999	95720000
2000	122410000
2001	153890000
2002	150480000
2003	144350000
2004	133700000
2005	153310000
2006	150910000
2007	188270000
2008	486390000
2009	331670000
2010	322530000
2011	320810000
2012	431230000
2013	3586310000
2014	1230820000
2015	1190080000
2016	1536860000
2017	1533650000