Year	US Dollars adjusted for inflation)
1950	10980
1951	11770
1952	11500
1953	11740
1954	12370
1955	13060
1956	13810
1957	14080
1958	13310
1959	14260
1960	15250
1961	16210
1962	16690
1963	17130
1964	17830
1965	17950
1966	18140
1967	18510
1968	18960
1969	19770
1970	21080
1971	21840
1972	22480
1973	23070
1974	23230
1975	21140
1976	21040
1977	21670
1978	22120
1979	22890
1980	24040
1981	24230
1982	23770
1983	23820
1984	24390
1985	24940
1986	25240
1987	25370
1988	25900
1989	26720
1990	27450
1991	26980
1992	26750
1993	26570
1994	26820
1995	26840
1996	26790
1997	27090
1998	27850
1999	27970
2000	28830
2001	29020
2002	28990
2003	28790
2004	29280