Year	Percent
1986	0.97501
1987	0.972
1991	0.98299
1994	0.97016
1995	0.97893
1999	0.99518
2000	0.98496
2001	0.99016
2003	0.99772
2004	1.00266
2005	0.98331
2006	0.9937
2007	1.00601
2008	0.99914
2009	1.00013
2010	1.00385
2011	0.99661
2012	0.9894
2013	0.98838
2014	0.9886
2015	0.98033
2016	0.97601