Year	US Dollars adjusted for inflation)
1970	8415
1971	8855
1972	9379
1973	9417
1974	8701
1975	8904
1976	9785
1977	10250
1978	10900
1979	10770
1980	10720
1981	10420
1982	10160
1983	10860
1984	10990
1985	11870
1986	12360
1987	13130
1988	13950
1989	14680
1990	15120
1991	15430
1992	15650
1993	16150
1994	16690
1995	16420
1996	16780
1997	17860
1998	18570
1999	19340
2000	21210
2001	21010
2002	21490
2003	22230