Year	US Dollars adjusted for inflation)
1960	1260
1961	1274
1962	1302
1963	1264
1964	1268
1965	1236
1966	1241
1967	1258
1968	1320
1969	1334
1970	1382
1971	1395
1972	1384
1973	1315
1974	1294
1975	1268
1976	1168
1977	1173
1978	1146
1979	1207
1980	1175
1981	1057
1982	1018
1983	1013
1984	1002
1985	996.4
1986	976.7
1987	946.5
1988	944
1989	953
1990	916.4
1991	937.1
1992	879.5
1993	872.7
1994	846.5
1995	842.3
1996	845.3
1997	853.8
1998	858.2
1999	811
2000	822.9
2001	833.7
2002	727
2003	758.5
2004	750.6