Year	US Dollars adjusted for inflation)
1970	410.8
1971	446
1972	492
1973	536.8
1974	580.9
1975	635.6
1976	700.4
1977	774.3
1978	856.4
1979	935.8
1980	1012
1981	1080
1982	1131
1983	1264
1984	1416
1985	1503
1986	1563
1987	1689
1988	1738
1989	1769
1990	1788
1991	1669
1992	1722
1993	1586
1994	1534
1995	1455
1996	1397
1997	1313
1998	1306
1999	1388
2000	1379
2001	1419
2002	1420
2003	1429