Year	Percent
1971	0.78051
1972	0.80721
1973	0.82524
1974	0.84198
1975	0.85868
1976	0.87299
1977	0.89189
1978	0.90801
1979	0.93734
1980	0.96724
1981	0.98125
1982	1.00021
1983	1.01741
1984	1.02756
1985	1.05127
1986	1.03734
1987	1.03755
1988	1.05487
1989	1.02705
1990	1.01579
1991	1.01588
1992	1.03835
1993	1.04044
1994	1.03759
1996	1.02595
1999	1.02688
2000	1.02661
2002	1.02168
2003	1.0223
2004	1.01839