Year	Percent
2005-01-01	68.7
2006-01-01	69.3
2007-01-01	69.6
2008-01-01	69.5
2009-01-01	67.6
2010-01-01	67.2
2011-01-01	67.5
2012-01-01	67.7
2013-01-01	68.0
2014-01-01	68.7
2015-01-01	69.1
2016-01-01	69.9