Year	US Dollars adjusted for inflation)
1950	10030
1951	9500
1952	9423
1953	9399
1954	10200
1955	10370
1956	10320
1957	10610
1958	10560
1959	10750
1960	12100
1961	12510
1962	12500
1963	12990
1964	13380
1965	14010
1966	14670
1967	13780
1968	13600
1969	14760
1970	14360
1971	14630
1972	15060
1973	15910
1974	16620
1975	16110
1976	16170
1977	15540
1978	15460
1979	15480
1980	15580
1981	16010
1982	16010
1983	16650
1984	17310
1985	17190
1986	17480
1987	17500
1988	17660
1989	17370
1990	17170
1991	16860
1992	16720
1993	17500
1994	18140
1995	18590
1996	18980
1997	19360
1998	19400
1999	20180
2000	20420
2001	20980
2002	21710
2003	22200
2004	22800