Year	US Dollars adjusted for inflation)
1970	626.6
1971	671
1972	720.7
1973	782.9
1974	852.1
1975	917.4
1976	987.9
1977	1067
1978	1188
1979	1276
1980	1468
1981	1589
1982	1491
1983	1677
1984	2056
1985	2247
1986	2375
1987	2497
1988	2621
1989	2765
1990	3103
1991	3226
1992	3311
1993	3396
1994	3500
1995	3617
1996	3867
1997	3970
1998	4202
1999	4085
2000	4530
2001	4464
2002	4653
2003	5154
2004	5086