Year	US Dollars adjusted for inflation)
1960	6961
1961	7328
1962	7778
1963	7467
1964	7624
1965	8093
1966	8287
1967	9163
1968	9377
1969	10600
1970	11620
1971	12030
1972	12280
1973	12120
1974	12400
1975	11530
1976	11300
1977	11770
1978	12410
1979	13400
1980	13480
1981	12890
1982	12660
1983	12860
1984	13580
1985	13450
1986	14360
1987	14820
1988	15030
1989	15170
1990	14580
1991	14330
1992	13740
1993	13270
1994	13590
1995	14020
1996	14240
1997	14540
1998	15050
1999	15540
2000	16090
2001	15500
2002	15450
2003	15710
2004	15940