Year	constant 2015 US$
1960	2390000
1961	3050000
1962	3920000
1963	3170000
1964	34610000
1965	14470000
1966	4740000
1967	7110000
1968	420000
1969	310000
1970	500000
1971	11200000
1972	48850000
1973	98440000
1974	667340000
1975	485100000
1976	569430000
1977	1118290000
1978	163220000
1979	579690000
1980	481280000
1981	567570000
1982	314260000
1983	164070000
1984	249570000
1985	177150000
1986	198900000
1987	77270000
1988	9210000
1989	37610000
1990	96210000
1991	17810000
1992	53250000
1993	173390000
1994	209900000
1995	81650000
1996	96670000
1997	127670000
1998	723680000
1999	64940000
2000	101230000
2001	7580000
2002	103090000
2003	75920000
2004	108650000
2005	19810000
2006	53710000
2007	206450000
2008	68540000
2009	137510000
2010	-20060000