Year	Percent
2005-01-01	49.9
2006-01-01	49.6
2007-01-01	49.5
2008-01-01	49.2
2009-01-01	49.1
2010-01-01	49.1
2011-01-01	49.1
2012-01-01	48.8
2013-01-01	48.7
2014-01-01	48.7
2015-01-01	48.6
2016-01-01	48.3