Year	US Dollars adjusted for inflation)
1951	2928
1952	2839
1953	3081
1954	3168
1955	3315
1956	3584
1957	3809
1958	3962
1959	4082
1960	4156
1961	4588
1962	4644
1963	5095
1964	5493
1965	5991
1966	6314
1967	6626
1968	7041
1969	7686
1970	8240
1971	8843
1972	9697
1973	10430
1974	9693
1975	10220
1976	10790
1977	10970
1978	11600
1979	11820
1980	11770
1981	11480
1982	11290
1983	11110
1984	11270
1985	11500
1986	11520
1987	11220
1988	11680
1989	12070
1990	12000
1991	12280
1992	12250
1993	11930
1994	12050
1995	12190
1996	12380
1997	12750
1998	13100
1999	13480
2000	13980
2001	14590
2002	15090
2003	15790
2004	16490