Year	US Dollars adjusted for inflation)
1960	4211
1961	4285
1962	4438
1963	4632
1964	4393
1965	4537
1966	4763
1967	5028
1968	5571
1969	6028
1970	6844
1971	7445
1972	8046
1973	8836
1974	9420
1975	9352
1976	9843
1977	10180
1978	10960
1979	11950
1980	13000
1981	13130
1982	13420
1983	14410
1984	15190
1985	14590
1986	14700
1987	15890
1988	17040
1989	18140
1990	19470
1991	20220
1992	20940
1993	23090
1994	24500
1995	25820
1996	26740
1997	28310
1998	26450
1999	27480
2000	29430
2001	27190
2002	27410
2003	27000
2004	29420