Year	Percent
1991-01-01	5.56799983978271
1992-01-01	5.63399982452393
1993-01-01	5.60300016403198
1994-01-01	5.66200017929077
1995-01-01	5.62500000000000
1996-01-01	5.30700016021729
1997-01-01	4.99399995803833
1998-01-01	4.62799978256226
1999-01-01	4.31599998474121
2000-01-01	4.04799985885620
2001-01-01	3.70300006866455
2002-01-01	3.42799997329712
2003-01-01	3.10700011253357
2004-01-01	2.81100010871887
2005-01-01	3.01799988746643
2006-01-01	2.72099995613098
2007-01-01	2.38899993896484
2008-01-01	2.06599998474121
2009-01-01	1.73899996280670
2010-01-01	1.62999999523163
2011-01-01	1.62800002098083
2012-01-01	1.62100005149841
2013-01-01	1.62399995326996
2014-01-01	1.61300003528595
2015-01-01	1.60500001907349
2016-01-01	1.65999996662140
2017-01-01	1.71200001239777