Year	US Dollars adjusted for inflation)
1950	9216
1951	9505
1952	9993
1953	10140
1954	9680
1955	10140
1956	10720
1957	10570
1958	10490
1959	10610
1960	10580
1961	10620
1962	11150
1963	11550
1964	12160
1965	12690
1966	13230
1967	13240
1968	13630
1969	14110
1970	14170
1971	14760
1972	15270
1973	16090
1974	16370
1975	16560
1976	17210
1977	17670
1978	18110
1979	18570
1980	18690
1981	19000
1982	18210
1983	18640
1984	19540
1985	20230
1986	20510
1987	21160
1988	21790
1989	22090
1990	21770
1991	20930
1992	20900
1993	21240
1994	22160
1995	22610
1996	22780
1997	23710
1998	24450
1999	25670
2000	26820
2001	26950
2002	27510
2003	27840
2004	28400