Quarter	Percent
2000-04-01	29.6
2001-04-01	30.1
2002-04-01	30.8
2003-04-01	32.7
2004-04-01	33.6
2005-01-01	35.2
2005-04-01	35.9
2005-07-01	35.9
2005-10-01	36.3
2006-01-01	36.4
2006-04-01	37
2006-07-01	37.6
2006-10-01	37.4
2007-01-01	37.2
2007-04-01	38.1
2007-07-01	38.0
2007-10-01	38.2
2008-01-01	37.8
2008-04-01	38.7
2008-07-01	38.9
2008-10-01	39.0
2009-01-01	39.4
2009-04-01	40.4
2009-07-01	40.0
2009-10-01	40.2
2010-01-01	40.5
2010-04-01	40.8
2010-07-01	41.3
2010-10-01	41.3
2011-01-01	41.9
2011-04-01	42.5
2011-07-01	42.8
2011-10-01	43.1
2012-01-01	43.6
2012-04-01	44.6
2012-07-01	45.0
2012-10-01	45.2
2013-01-01	45.6
2013-04-01	46.3
2013-07-01	46.9
2013-10-01	47.3
2014-01-01	47.6
2014-04-01	48.3
2014-07-01	48.7
2014-10-01	49.1
2015-01-01	49.2
2015-04-01	49.9
2015-07-01	50.3
2015-10-01	50.6
2016-01-01	51.2
2016-04-01	52.1
2016-07-01	52.2
2016-10-01	52.5
2017-01-01	52.9
2017-04-01	53.9
2017-07-01	54.0
2017-10-01	54.3
2018-01-01	54.6
2018-04-01	55.1