Quarter	Percent
1999-01-01	68
1999-04-01	69.2
1999-07-01	70.1
1999-10-01	69.8
2000-01-01	70.1
2000-04-01	71
2000-07-01	71.9
2000-10-01	71.8
2001-01-01	71.6
2001-04-01	72.5
2001-07-01	73.1
2001-10-01	72.7
2002-01-01	72.1
2002-04-01	72.8
2002-07-01	73
2002-10-01	72.6
2003-01-01	72.5
2003-04-01	73.2
2003-07-01	73.7
2003-10-01	73.4
2004-01-01	73
2004-04-01	73.4
2004-07-01	74
2004-10-01	74
2005-01-01	74.1
2005-04-01	74.9
2005-07-01	75.9
2005-10-01	75.5
2006-01-01	75.5
2006-04-01	76
2006-07-01	76.6
2006-10-01	76.1
2007-01-01	75.8
2007-04-01	76.5
2007-07-01	76.6
2007-10-01	75.6
2008-01-01	74.9
2008-04-01	74.3
2008-07-01	73.4
2008-10-01	70.7
2009-01-01	67.5
2009-04-01	66.8
2009-07-01	66.3
2009-10-01	65.3
2010-01-01	64.4
2010-04-01	65
2010-07-01	65.3
2010-10-01	64.4
2011-01-01	63.6
2011-04-01	63.8
2011-07-01	63.7
2011-10-01	62.3
2012-01-01	60.6
2012-04-01	60.6
2012-07-01	60.6
2012-10-01	59.4
2013-01-01	58.4
2013-04-01	59.2
2013-07-01	59.8
2013-10-01	59.5
2014-01-01	58.9
2014-04-01	60.6
2014-07-01	61.7
2014-10-01	61.5
2015-01-01	61.2
2015-04-01	62.9
2015-07-01	63.8
2015-10-01	63.7
2016-01-01	63.7
2016-04-01	64.6
2016-07-01	65.5
2016-10-01	65.2
2017-01-01	65.1
2017-04-01	66.5
2017-07-01	67.5
2017-10-01	66.9
2018-01-01	66.5
2018-04-01	68.0
2018-07-01	68.7