Year	current US$
1976	5638000000
1977	8032000000
1978	9061000000
1979	5560000000
1980	5061000000
1981	3241000000
1982	2949000000
1983	4110000000
1984	3586000000
1985	3157000000
1986	2189000000
1987	2217000000
1988	2220000000
1989	2418000000
1990	3703000000
1991	5403000000
1992	5541000000
1993	5484000000
1994	3062000000
1995	2192000000
1996	2899000000
1997	3182000000
1998	2571000000
1999	1905000000
2000	1577000000