Year	constant 2015 US$
1960	60000
1961	3610000
1962	5290000
1963	280000
1964	500000
1965	560000
1966	550000
1967	470000
1968	200000
1969	200000
1970	70000
1971	280000
1972	110000
1973	660000
1974	720000
1975	590000
1976	430000
1977	260000
1978	260000
1979	220000
1980	60000
1981	390000
1982	620000
1983	980000
1984	1810000
1985	3170000
1986	4070000
1987	4470000
1988	5510000
1989	5660000
1990	4950000
1991	4270000
1992	5890000
1993	4840000
1994	4670000
1995	3350000
1996	2870000
1997	410000
1998	380000
1999	1850000
2000	950000
2001	500000
2002	-870000
2003	500000
2004	790000