Year	US Dollars adjusted for inflation)
1960	6596
1961	7086
1962	7807
1963	9204
1964	10290
1965	11280
1966	10470
1967	12230
1968	12410
1969	13480
1970	14430
1971	14890
1972	17460
1973	18710
1974	21120
1975	20540
1976	28770
1977	21740
1978	15000
1979	14600
1980	15750
1981	14110
1982	14270
1983	14030
1984	14140
1985	14010
1986	13180
1987	12670
1988	12380
1989	12310
1990	13050
1991	13200
1992	12870
1993	12960
1994	13640
1995	13470
1996	13290
1997	12620
1998	12320
1999	11120
2000	10440
2001	9985
2002	9650
2003	9562
2004	9257