Year	US Dollars adjusted for inflation)
1970	9756
1971	10800
1972	9901
1973	15220
1974	38430
1975	43250
1976	43630
1977	44560
1978	38130
1979	42140
1980	46960
1981	43740
1982	36680
1983	31560
1984	30130
1985	27090
1986	20160
1987	20900
1988	19860
1989	22000
1990	25290
1991	24630
1992	24710
1993	22450
1994	24010
1995	25350
1996	26940
1997	28790
1998	28590
1999	29110
2000	32180
2001	32850
2002	32980
2003	35680