Year	Percent
1972	1.16034
1973	1.03344
1977	1.0335
1981	1.10286
1982	1.0574
1983	1.04396
1984	1.04282
1985	1.07979
1986	1.07296
1987	1.05513
1990	1.03233
1991	1.0296
1992	1.04415
1993	1.06798
1997	1.00902
1999	1.03456
2000	1.06411
2001	1.04258
2002	1.06111
2003	1.03406
2004	0.95298
2005	1.02915
2006	1.00546
2007	1.01249