Year	US Dollars adjusted for inflation)
1950	2972
1951	3445
1952	3585
1953	3425
1954	3858
1955	4052
1956	4327
1957	4480
1958	4632
1959	4485
1960	4965
1961	5532
1962	6045
1963	6577
1964	6858
1965	7249
1966	7723
1967	7962
1968	8374
1969	9058
1970	9327
1971	9625
1972	10350
1973	11080
1974	11620
1975	11550
1976	11840
1977	11960
1978	11960
1979	11900
1980	12060
1981	11950
1982	12030
1983	12190
1984	12350
1985	12580
1986	12950
1987	13610
1988	14250
1989	14890
1990	15400
1991	15730
1992	15830
1993	15600
1994	15920
1995	16310
1996	16660
1997	17260
1998	17980
1999	18740
2000	19540
2001	20030
2002	20320
2003	20640
2004	20970