Year	US Dollars adjusted for inflation)
1953	2235
1954	2444
1955	2647
1956	2882
1957	3178
1958	3205
1959	3263
1960	3394
1961	3526
1962	3577
1963	3759
1964	3885
1965	3951
1966	3916
1967	3851
1968	3831
1969	3925
1970	4410
1971	4498
1972	4881
1973	4854
1974	4677
1975	4452
1976	4353
1977	4274
1978	4232
1979	4026
1980	3729
1981	3761
1982	3743
1983	3913
1984	3798
1985	3619
1986	3620
1987	3966
1988	4015
1989	4244
1990	4446
1991	4419
1992	4585
1993	4743
1994	4714
1995	4682
1996	4612
1997	4561
1998	4680
1999	4541
2000	4521
2001	4580
2002	4588
2003	4584