Year	Percent
1991-01-01	5.54300022125244
1992-01-01	5.55200004577637
1993-01-01	5.56400012969971
1994-01-01	5.55900001525879
1995-01-01	5.56199979782104
1996-01-01	5.56400012969971
1997-01-01	5.57000017166138
1998-01-01	5.56199979782104
1999-01-01	5.56300020217896
2000-01-01	5.55299997329712
2001-01-01	5.56300020217896
2002-01-01	5.57299995422363
2003-01-01	5.55299997329712
2004-01-01	5.55499982833862
2005-01-01	5.55900001525879
2006-01-01	5.55499982833862
2007-01-01	5.57899999618530
2008-01-01	5.56300020217896
2009-01-01	5.54099988937378
2010-01-01	5.55900001525879
2011-01-01	5.56500005722046
2012-01-01	5.56500005722046
2013-01-01	5.55000019073486
2014-01-01	5.54600000381470
2015-01-01	5.54099988937378
2016-01-01	5.53700017929077
2017-01-01	5.52699995040894