Year	constant 2015 US$
1960	80350000
1961	56220000
1962	66810000
1963	118470000
1964	75150000
1965	229770000
1966	116980000
1967	119700000
1968	70920000
1969	95080000
1970	110210000
1971	158800000
1972	92320000
1973	114880000
1974	96610000
1975	115490000
1976	139880000
1977	109060000
1978	82500000
1979	87600000
1980	103280000
1981	88040000
1982	91560000
1983	103990000
1984	153790000
1985	146220000
1986	97430000
1987	67410000
1988	35810000
1989	31760000
1990	163330000
1991	163740000
1992	221120000
1993	97640000
1994	34300000
1995	43110000
1996	46690000
1997	45420000
1998	29800000
1999	20870000
2000	27020000
2001	41310000
2002	29660000
2003	32150000
2004	24640000
2005	21830000
2006	37030000
2007	-100280000
2008	28800000
2009	57080000
2010	107300000
2011	89490000
2012	46490000
2013	9880000
2014	-165020000
2015	8710000
2016	22610000
2017	40540000