Year	current US$
1970	1000000
1971	1000000
1972	9000000
1973	13000000
1974	5000000
1975	15000000
1976	31000000
1977	55000000
1978	28000000
1979	11000000
1980	20000000
1981	1000000
1983	1000000
1984	2000000
1985	18000000
1986	22000000
1987	17000000
1988	15000000
1989	19000000
1990	16000000
1991	18300000.01192093
1992	98000000
1993	39000000
1994	41000000
1995	20000000
1996	40000000
1997	7000000
1998	29240000.018849976
1999	25720000.118017234
2000	15600000.113248818
2001	23080000.430345558
2002	9640000.060200736
2003	9690000.236034399
2004	24470000.386238094