Quarter	Percent
1999-04-01	66.5
2000-04-01	70.6
2001-04-01	75.8
2002-04-01	65.5
2003-01-01	58.6
2003-04-01	73.6
2003-07-01	77.9
2003-10-01	63.1
2004-01-01	57
2004-04-01	69.4
2004-07-01	74
2004-10-01	60
2005-01-01	54.4
2005-04-01	74.5
2005-07-01	79
2005-10-01	63.3
2006-01-01	60.5
2006-04-01	74.2
2006-07-01	78
2006-10-01	67.8
2007-01-01	68.8
2007-04-01	76
2007-07-01	80.4
2007-10-01	70.7
2008-01-01	67
2008-04-01	75.1
2008-07-01	79.1
2008-10-01	59
2009-01-01	53.7
2009-04-01	59.5
2009-07-01	66.3
2009-10-01	48.1
2010-01-01	51.3
2010-04-01	61
2010-07-01	65.8
2010-10-01	54.8
2011-01-01	50.4
2011-04-01	63.4
2011-07-01	67.6
2011-10-01	53
2012-01-01	52.6
2012-04-01	70.5
2012-07-01	70.5
2012-10-01	57.4
2013-01-01	56.1
2013-04-01	65.7
2013-07-01	74.5
2013-10-01	62.3
2014-01-01	60.1
2014-04-01	72.1
2014-07-01	73.8
2014-10-01	64.2
2015-01-01	65.0
2015-04-01	74.3
2015-07-01	77.5
2015-10-01	62.7
2016-01-01	71.1
2016-04-01	80.5
2016-07-01	83.4
2016-10-01	73.4
2017-01-01	70.2
2017-04-01	82.1
2017-07-01	78.2
2017-10-01	69.6
2018-01-01	69.8
2018-04-01	76.9