Year	Ratio
1999-01-01	0.981570005416870
2000-01-01	0.966870009899139
2001-01-01	0.969399988651276
2002-01-01	0.947759985923767
2003-01-01	0.931500017642975
2004-01-01	0.923409998416901
2005-01-01	0.938030004501343
2006-01-01	0.955470025539398
2007-01-01	0.956110000610352
2008-01-01	0.960789978504181
2009-01-01	0.971279978752136
2010-01-01	0.986959993839264
2011-01-01	0.971710026264191
2012-01-01	1.025079965591430
2013-01-01	0.978100001811981
2014-01-01	0.968640029430389