Year	US Dollars adjusted for inflation)
1960	3898
1961	3530
1962	2626
1963	3284
1964	3778
1965	4086
1966	3685
1967	3836
1968	4017
1969	4100
1970	4280
1971	3830
1972	4621
1973	4426
1974	4044
1975	3988
1976	4343
1977	4277
1978	4437
1979	5281
1980	5056
1981	4912
1982	5163
1983	5278
1984	5461
1985	5457
1986	5743
1987	5934
1988	5573
1989	5578
1990	5570
1991	5537
1992	5617
1993	5432
1994	5228
1995	5324
1996	5513
1997	5457
1998	5508
1999	5611
2000	5753
2001	5726
2002	5723
2003	5993