Year	Percent
1971	0.91834
1975	0.92724
1976	0.92327
1977	0.94559
1983	0.96089
1984	0.95677
1986	0.96188
1988	0.97627
1989	0.97585
1993	0.99058
1994	0.99027
1995	0.98486
1996	0.98964
1998	1.00685
1999	1.01786
2000	1.02583
2001	1.02401
2002	1.02296
2003	1.02354
2004	1.00171
2005	0.99594
2006	1.00692
2007	1.02913
2008	1.01888
2009	1.01753
2010	1.01162
2011	1.00465
2012	0.99753
2013	1.01816
2014	1.01443
2015	1.00379