Year	Percent
1991-01-01	9.80762384585873
1992-01-01	8.84294877097609
1993-01-01	8.81263002177315
1994-01-01	8.86402202681789
1995-01-01	9.32942209010038
1996-01-01	9.43252079707441
1997-01-01	9.85422767687469
1998-01-01	10.54426474420090
1999-01-01	10.77027286349800
2000-01-01	10.44923334177110
2001-01-01	10.46910590559100
2002-01-01	10.39438890614860
2003-01-01	10.13214688011710
2004-01-01	10.28532633350430
2005-01-01	10.40280197978120
2006-01-01	10.40535254424450
2007-01-01	9.79291446367071
2008-01-01	10.50551212804290
2009-01-01	10.37512956833140
2010-01-01	9.96644719515344
2011-01-01	10.17129867893650
2012-01-01	10.03488999937880
2013-01-01	10.17706531095750
2014-01-01	10.29399791680860
2015-01-01	10.61009870272160
2016-01-01	10.40626769167940
2017-01-01	10.37723835593650