Year	US Dollars adjusted for inflation)
1970	2162
1971	2078
1972	2284
1973	2720
1974	3882
1975	4029
1976	2904
1977	2726
1978	2715
1979	2421
1980	1291
1981	1311
1982	1422
1983	1263
1984	1341
1985	1261
1986	1245
1987	1174
1988	1350
1989	1200
1990	1192
1991	1240
1992	1187
1993	1176
1994	1241
1995	1275
1996	1281
1997	1321
1998	1353
1999	1444
2000	1432
2001	1425
2002	1405
2003	1424