Year	US Dollars adjusted for inflation)
1959	2689
1960	3067
1961	3218
1962	3094
1963	3142
1964	2807
1965	2865
1966	2851
1967	2749
1968	2728
1969	2637
1970	2319
1971	2374
1972	2335
1973	2310
1974	2380
1975	2398
1976	2560
1977	2434
1978	2516
1979	2463
1980	2546
1981	2464
1982	2474
1983	2297
1984	2163
1985	2107
1986	2146
1987	2146
1988	2253
1989	2233
1990	2196
1991	2158
1992	2188
1993	2207
1994	2130
1995	2261
1996	2323
1997	2392
1998	2543
1999	2553
2000	2546
2001	2721
2002	2853
2003	2888
2004	2934