Quarter	Percent
1999-04-01	28.7
2000-04-01	28.7
2001-04-01	29.3
2002-04-01	29.8
2003-04-01	31.2
2004-04-01	33.1
2005-01-01	36.9
2005-04-01	37.3
2005-07-01	37.3
2005-10-01	38.8
2006-01-01	39.1
2006-04-01	39.7
2006-07-01	40.5
2006-10-01	41.9
2007-01-01	41.5
2007-04-01	44
2007-07-01	43.6
2007-10-01	44.5
2008-01-01	44.9
2008-04-01	46
2008-07-01	46.2
2008-10-01	46.9
2009-01-01	47.4
2009-04-01	49.2
2009-07-01	48.4
2009-10-01	49.4
2010-01-01	50.7
2010-04-01	50.4
2010-07-01	50.9
2010-10-01	50.8
2011-01-01	52.3
2011-04-01	53.1
2011-07-01	53.8
2011-10-01	53.7
2012-01-01	54.3
2012-04-01	54.6
2012-07-01	55.6
2012-10-01	55.3
2013-01-01	56.6
2013-04-01	57.2
2013-07-01	58.2
2013-10-01	58.6
2014-01-01	58.9
2014-04-01	60.1
2014-07-01	60.4
2014-10-01	60.5
2015-01-01	60.5
2015-04-01	61.1
2015-07-01	61.5
2015-10-01	61.7
2016-01-01	62.7
2016-04-01	63.4
2016-07-01	64.0
2016-10-01	64.1
2017-01-01	64.6
2017-04-01	65.3
2017-07-01	65.4
2017-10-01	66.2
2018-01-01	66.1
2018-04-01	66.2