Year	Ratio
1993-01-01	0.991289973258972
1994-01-01	0.985379993915558
1995-01-01	0.962339997291565
1996-01-01	0.960319995880127
1997-01-01	0.956619977951050
1998-01-01	0.959810018539429
1999-01-01	0.986159980297089
2000-01-01	0.988409996032715
2001-01-01	0.988340020179749
2002-01-01	0.985939979553223
2003-01-01	0.987720012664795
2004-01-01	0.968100011348724
2005-01-01	0.967109978199005
2006-01-01	0.979130029678345
2007-01-01	0.984860002994537
2008-01-01	0.994989991188049
2009-01-01	0.993260025978088
2010-01-01	0.997919976711273
2011-01-01	0.998849987983704
2012-01-01	1.000599980354310
2013-01-01	1.001929998397830
2014-01-01	1.003370046615600
2015-01-01	1.001950025558470
2016-01-01	1.003219962120060