Year	US Dollars adjusted for inflation)
1972	1289
1973	1325
1974	1233
1975	1331
1976	1294
1977	1350
1978	1374
1979	1351
1980	1347
1981	1332
1982	1335
1983	1385
1984	1402
1985	1387
1986	1421
1987	1442
1988	1506
1989	1549
1990	1581
1991	1609
1992	1613
1993	1679
1994	1658
1995	1615
1996	1713
1997	1767
1998	1771
1999	1800
2000	1851
2001	1983
2002	2049
2003	2155