Year	Percent
1971	1.00021
1972	0.99395
1973	1.00627
1974	1.00759
1975	1.00665
1976	1.04375
1977	1.03767
1978	1.0409
1979	1.03542
1980	1.04906
1981	1.05208
1982	1.06255
1983	1.06164
1984	1.06119
1985	1.0661
1987	1.01817
1988	1.0122
1989	1.01956
1990	1.02301
1991	1.02401
1992	1.02302
1993	1.08131
1994	1.07839
1995	1.08777
1996	1.09907
1997	1.10884
1998	1.15064
1999	1.15224
2000	1.15219
2001	1.14744
2002	1.12452
2003	1.10784
2004	1.0136
2005	0.99616
2006	0.99632
2007	0.99474
2008	0.99411
2009	0.99344
2010	0.99194
2011	0.99264
2012	0.99228
2013	1.09816
2014	1.09618
2015	1.09099