Year	Percent
2005-01-01	6.04916666666667
2006-01-01	6.16000000000000
2007-01-01	6.08750000000000
2008-01-01	7.10119025222222
2009-01-01	5.66529527533333
2010-01-01	6.25287411491667
2011-01-01	5.96964461600000
2012-01-01	5.42557054158333
2013-01-01	5.30873714616667
2014-01-01	4.73661526700000
2015-01-01	4.48022146433333
2016-01-01	4.40527682450000
2017-01-01	4.24495834508333