Year	Percent
1971	0.98969
1972	1.02172
1974	1.0305
1975	1.05604
1976	1.03941
1982	1.0769
1984	1.04442
1986	1.05498
1987	1.06475
1991	1.06549
2000	1.06276
2001	1.02241
2002	1.01025
2003	1.01
2004	1.00014
2005	1.0156
2007	1.01902
2008	1.00001
2009	0.97898
2010	0.97071
2011	0.95298
2012	0.96215
2013	0.95177
2014	0.96999
2015	0.97405
2016	0.98035