Year	US Dollars adjusted for inflation)
1950	4620
1951	4936
1952	4465
1953	4265
1954	4838
1955	5320
1956	5781
1957	5717
1958	5873
1959	6291
1960	6526
1961	7106
1962	7521
1963	7918
1964	8340
1965	8700
1966	8407
1967	8420
1968	9776
1969	10890
1970	11460
1971	12250
1972	13090
1973	13980
1974	14240
1975	14490
1976	13940
1977	13490
1978	14010
1979	14350
1980	14010
1981	14580
1982	14710
1983	15010
1984	14690
1985	14710
1986	15150
1987	16190
1988	16280
1989	15910
1990	16540
1991	17160
1992	17680
1993	18000
1994	18820
1995	19660
1996	20330
1997	20510
1998	20780
1999	20960
2000	22240
2001	21600
2002	20950
2003	20720
2004	21240