Year	Ratio
1991-01-01	0.997669994831085
1992-01-01	1.027209997177120
1993-01-01	1.021909952163700
1994-01-01	1.070510029792790
1995-01-01	1.072829961776730
1996-01-01	1.077829957008360
1997-01-01	1.074620008468630
1998-01-01	1.042850017547610
1999-01-01	1.036659955978390
2000-01-01	1.027750015258790
2001-01-01	1.016800045967100
2002-01-01	1.006520032882690
2003-01-01	0.996259987354279
2004-01-01	0.994440019130707
2005-01-01	0.999700009822845
2006-01-01	1.001009941101070
2007-01-01	1.021499991416930
2008-01-01	1.017740011215210
2009-01-01	1.004899978637700
2010-01-01	0.975950002670288
2011-01-01	0.961419999599457
2012-01-01	0.967279970645905
2013-01-01	0.964500010013580
2014-01-01	0.974860012531281
2015-01-01	0.990239977836609