Year	Percent
2005-01-01	69.2
2006-01-01	69.7
2007-01-01	70.0
2008-01-01	70.5
2009-01-01	70.9
2010-01-01	71.1
2011-01-01	71.3
2012-01-01	71.6
2013-01-01	71.8
2014-01-01	72.0
2015-01-01	72.1
2016-01-01	72.6