Quarterly Percent
2006-01-01 55.1
2006-04-01 58.4
2006-07-01 58.6
2006-10-01 57.6
2007-01-01 56
2007-04-01 58.7
2007-07-01 58.6
2007-10-01 56.8
2008-01-01 56
2008-04-01 59.2
2008-07-01 59.4
2008-10-01 58.4
2009-01-01 57.3
2009-04-01 60.1
2009-07-01 60.5
2009-10-01 59.8
2010-01-01 59.7
2010-04-01 62.1
2010-07-01 61.5
2010-10-01 61
2011-01-01 61
2011-04-01 63.3
2011-07-01 62.9
2011-10-01 62
2012-01-01 60.9
2012-04-01 63.5
2012-07-01 63.2
2012-10-01 63.7
2013-01-01 62.9
2013-04-01 65.1
2013-07-01 63.9
2013-10-01 64
2014-01-01 63.4
2014-04-01 65
2014-07-01 64.6
2014-10-01 64.7
2015-01-01 64.6
2015-04-01 66.0
2015-07-01 65.5
2015-10-01 65.7
2016-01-01 65.4
2016-04-01 66.9
2016-07-01 66.7
2016-10-01 66.9
2017-01-01 66.8
2017-04-01 67.9
2017-07-01 67.7
2017-10-01 67.7
2018-01-01 67.3
2018-04-01 68.1
