Year	US Dollars adjusted for inflation)
1950	2386
1951	2611
1952	2697
1953	2815
1954	2919
1955	3017
1956	3130
1957	3258
1958	3275
1959	3442
1960	3677
1961	3909
1962	4135
1963	4343
1964	4586
1965	4922
1966	5126
1967	5562
1968	6267
1969	6488
1970	6988
1971	7469
1972	8002
1973	8849
1974	8988
1975	8335
1976	8786
1977	9208
1978	9235
1979	9561
1980	9957
1981	10110
1982	10280
1983	10160
1984	9886
1985	10130
1986	10730
1987	11400
1988	12290
1989	12910
1990	13620
1991	14040
1992	14160
1993	14000
1994	14460
1995	14680
1996	15150
1997	15660
1998	16290
1999	16830
2000	17320
2001	17550
2002	17570
2003	17330
2004	17400