Year	US Dollars adjusted for inflation)
1951	4291
1952	4436
1953	4836
1954	4432
1955	4583
1956	4509
1957	4728
1958	4863
1959	4666
1960	5022
1961	5063
1962	5188
1963	5330
1964	5349
1965	5294
1966	5768
1967	5795
1968	5940
1969	6099
1970	6165
1971	6634
1972	6526
1973	6119
1974	6129
1975	5213
1976	5247
1977	5649
1978	6018
1979	6443
1980	6675
1981	6936
1982	5901
1983	5616
1984	5807
1985	5795
1986	5981
1987	6201
1988	6517
1989	7041
1990	7143
1991	7552
1992	8314
1993	8746
1994	9120
1995	9911
1996	10520
1997	11050
1998	11250
1999	11140
2000	11430
2001	11660
2002	11780
2003	12140
2004	12680