Year	US Dollars adjusted for inflation)
1950	8796
1951	8449
1952	8548
1953	9059
1954	9424
1955	9257
1956	9430
1957	9767
1958	9877
1959	10720
1960	11350
1961	12010
1962	12640
1963	12600
1964	13680
1965	14160
1966	14480
1967	14900
1968	15320
1969	16180
1970	16470
1971	16770
1972	17440
1973	17970
1974	17600
1975	17200
1976	18270
1977	18400
1978	18660
1979	19190
1980	19020
1981	18580
1982	19100
1983	19460
1984	20190
1985	20930
1986	21810
1987	21780
1988	22030
1989	22030
1990	22200
1991	22420
1992	22790
1993	22630
1994	23860
1995	24540
1996	25120
1997	25890
1998	26370
1999	26900
2000	27830
2001	27880
2002	27880
2003	27970
2004	28450