Year	US Dollars adjusted for inflation)
1970	14960
1971	17510
1972	20950
1973	26600
1974	32130
1975	30490
1976	31520
1977	30270
1978	28630
1979	30960
1980	30970
1981	30680
1982	24660
1983	19960
1984	18240
1985	17380
1986	17260
1987	16140
1988	16570
1989	16050
1990	17420
1991	18570
1992	18680
1993	17650
1994	17400
1995	16920
1996	17000
1997	16760
1998	16460
1999	15550
2000	15830
2001	15480
2002	14690
2003	16010