Year	US Dollars adjusted for inflation)
1960	1263
1961	1346
1962	1394
1963	1502
1964	1575
1965	1787
1966	1841
1967	2011
1968	2100
1969	2232
1970	2375
1971	2641
1972	2879
1973	3408
1974	3244
1975	3548
1976	4246
1977	4484
1978	5152
1979	5403
1980	5627
1981	5827
1982	5956
1983	6217
1984	6580
1985	6533
1986	6644
1987	6678
1988	6573
1989	6011
1990	5637
1991	4914
1992	4511
1993	4582
1994	4801
1995	5236
1996	5519
1997	5282
1998	5145
1999	5147
2000	5211
2001	5475
2002	5789
2003	6058
2004	6586