Year	US Dollars adjusted for inflation)
1970	1374
1971	1380
1972	1618
1973	1384
1974	1469
1975	1393
1976	1190
1977	1307
1978	1443
1979	1257
1980	1137
1981	1107
1982	1202
1983	1105
1984	992.4
1985	878.4
1986	980.1
1987	993.1
1988	1034
1989	998.8
1990	993.6
1991	1014
1992	943.4
1993	949.6
1994	749.2
1995	735.8
1996	744.2
1997	704.8
1998	699.4
1999	682.7
2000	681.6
2001	680
2002	679.8
2003	682.5
2004	672.5