Year	US Dollars adjusted for inflation)
1951	1016
1952	1099
1953	1162
1954	1228
1955	1283
1956	1300
1957	1350
1958	1395
1959	1449
1960	1491
1961	1547
1962	1621
1963	1721
1964	1882
1965	2035
1966	2159
1967	2326
1968	2480
1969	2639
1970	2872
1971	3173
1972	3529
1973	3906
1974	3868
1975	3991
1976	4450
1977	4806
1978	5357
1979	5672
1980	5945
1981	6204
1982	6327
1983	6762
1984	7378
1985	7661
1986	8464
1987	9423
1988	10040
1989	10750
1990	11280
1991	12000
1992	12760
1993	13530
1994	14390
1995	15180
1996	15990
1997	16840
1998	17410
1999	18250
2000	19180
2001	18750
2002	19370
2003	19890
2004	20870