Year	US Dollars adjusted for inflation)
1950	3523
1951	3801
1952	4243
1953	4277
1954	4572
1955	4660
1956	4579
1957	4794
1958	4676
1959	4455
1960	4493
1961	4644
1962	4979
1963	5151
1964	5471
1965	5864
1966	5804
1967	6086
1968	6015
1969	6141
1970	6074
1971	6204
1972	6307
1973	6273
1974	6412
1975	6862
1976	6997
1977	6879
1978	6813
1979	5552
1980	5297
1981	5329
1982	5203
1983	5551
1984	5525
1985	5111
1986	5081
1987	4540
1988	4280
1989	3862
1990	3893
1991	3438
1992	3388
1993	3260
1994	3200
1995	3270
1996	3291
1997	3199
1998	3236
1999	3253
2000	3438
2001	3470
2002	3358
2003	3410
2004	3420