Quarter	Percent
1999-01-01	53.5
1999-04-01	53.6
1999-07-01	51.5
1999-10-01	52.5
2000-01-01	53.5
2000-04-01	53.3
2000-07-01	49.9
2000-10-01	51.2
2001-01-01	53.4
2001-04-01	52.6
2001-07-01	49.8
2001-10-01	51.3
2002-01-01	51.5
2002-04-01	51.4
2002-07-01	49.4
2002-10-01	51
2003-01-01	51.4
2003-04-01	50.7
2003-07-01	48.3
2003-10-01	49.9
2004-01-01	50.4
2004-04-01	50.2
2004-07-01	47.8
2004-10-01	50
2005-01-01	48.4
2005-04-01	47.9
2005-07-01	45.3
2005-10-01	48.2
2006-01-01	49.2
2006-04-01	48.3
2006-07-01	45.4
2006-10-01	48.3
2007-01-01	48.9
2007-04-01	47.6
2007-07-01	45.7
2007-10-01	49.2
2008-01-01	49.3
2008-04-01	49
2008-07-01	45.9
2008-10-01	49.9
2009-01-01	51.1
2009-04-01	51.3
2009-07-01	50.6
2009-10-01	54.2
2010-01-01	55.2
2010-04-01	54.1
2010-07-01	54
2010-10-01	56.8
2011-01-01	57.8
2011-04-01	57.5
2011-07-01	55.3
2011-10-01	59.2
2012-01-01	60.4
2012-04-01	59.6
2012-07-01	57.5
2012-10-01	61.1
2013-01-01	60.5
2013-04-01	60.4
2013-07-01	59.1
2013-10-01	61.7
2014-01-01	62.8
2014-04-01	62.8
2014-07-01	61.1
2014-10-01	64
2015-01-01	64.3
2015-04-01	64.1
2015-07-01	62.0
2015-10-01	64.9
2016-01-01	65.8
2016-04-01	64.8
2016-07-01	64.2
2016-10-01	66.2
2017-01-01	66.4
2017-04-01	65.4
2017-07-01	62.0
2017-10-01	65.8
2018-01-01	66.5
2018-04-01	64.7
2018-07-01	62.6