Year	US Dollars adjusted for inflation)
1954	3186
1955	2622
1956	3424
1957	3489
1958	3957
1959	4202
1960	4187
1961	4581
1962	4455
1963	4615
1964	4875
1965	5231
1966	5214
1967	5307
1968	4963
1969	4871
1970	4249
1971	4022
1972	4070
1973	3802
1974	3646
1975	3273
1976	3580
1977	3383
1978	4002
1979	4227
1980	4429
1981	4245
1982	4462
1983	4572
1984	4969
1985	5058
1986	5364
1987	5272
1988	4958
1989	4063
1990	3538
1991	3408
1992	3384
1993	3412
1994	3602
1995	3783
1996	3764
1997	3891
1998	3912
1999	3892
2000	3902
2001	3905
2002	3922
2003	3742