Year	US Dollars adjusted for inflation)
1953	1449
1954	1441
1955	1514
1956	1528
1957	1592
1958	1593
1959	1572
1960	1544
1961	1579
1962	1568
1963	1667
1964	1754
1965	1798
1966	1973
1967	2035
1968	2213
1969	2473
1970	2621
1971	2788
1972	2870
1973	3132
1974	3359
1975	3458
1976	3758
1977	4083
1978	4474
1979	4787
1980	4557
1981	4725
1982	5007
1983	5457
1984	5887
1985	6194
1986	6742
1987	7420
1988	8142
1989	8689
1990	9591
1991	10400
1992	10810
1993	11400
1994	12320
1995	13270
1996	14120
1997	14550
1998	13260
1999	14570
2000	15700
2001	16160
2002	17130
2003	17600
2004	18420