Year	US Dollars adjusted for inflation)
1970	7005
1971	7438
1972	8037
1973	8683
1974	9390
1975	10150
1976	10970
1977	11890
1978	12770
1979	13610
1980	14290
1981	14960
1982	15590
1983	16030
1984	16800
1985	16670
1986	17250
1987	19150
1988	20110
1989	20730
1990	21870
1991	21620
1992	23160
1993	23870
1994	24460
1995	25260
1996	25320
1997	24940
1998	23840
1999	22980
2000	24220
2001	24680
2002	26850
2003	30420
2004	37960