Year	constant 2015 US$
1960	160470000
1961	821720000
1962	382450000
1963	188520000
1964	49940000
1965	166160000
1966	113160000
1967	279300000
1968	87710000
1969	134300000
1970	153820000
1971	62400000
1972	50940000
1973	-14530000
1974	36050000
1975	5590000
1976	-16890000
1977	115920000
1978	607170000
1979	9430000
1980	62130000
1981	14000000
1982	1650000
1983	108750000
1984	24210000
1985	32810000
1986	52060000
1987	115360000
1988	124540000
1989	144800000
1990	157010000
1991	255590000
1992	142880000
1993	183070000
1994	162020000
1995	181980000
1996	161070000
1997	233570000
1998	197370000
1999	193030000
2000	165690000
2001	154460000
2002	154870000
2003	154250000
2004	201980000
2005	105600000
2006	118210000
2007	93230000
2008	84520000
2009	81560000
2010	100370000
2011	91660000
2012	133410000
2013	113710000
2014	63880000
2015	111490000
2016	116190000
2017	137040000