Quarter	Percent
2000-04-01	26.6
2001-04-01	26.9
2002-04-01	28.2
2003-04-01	30.2
2004-04-01	31.3
2005-01-01	33.6
2005-04-01	34.3
2005-07-01	34.1
2005-10-01	34.8
2006-01-01	35.3
2006-04-01	35.7
2006-07-01	35.7
2006-10-01	36.3
2007-01-01	36.6
2007-04-01	37.7
2007-07-01	37.1
2007-10-01	37.6
2008-01-01	37.4
2008-04-01	38.4
2008-07-01	38.4
2008-10-01	38.8
2009-01-01	39.4
2009-04-01	40.4
2009-07-01	39.8
2009-10-01	40.3
2010-01-01	40.8
2010-04-01	40.9
2010-07-01	41.1
2010-10-01	41.4
2011-01-01	42.1
2011-04-01	43.0
2011-07-01	43.2
2011-10-01	43.6
2012-01-01	44.3
2012-04-01	45.3
2012-07-01	45.7
2012-10-01	45.9
2013-01-01	46.5
2013-04-01	47.0
2013-07-01	47.7
2013-10-01	48.1
2014-01-01	48.5
2014-04-01	49.4
2014-07-01	49.7
2014-10-01	50.2
2015-01-01	50.5
2015-04-01	51.2
2015-07-01	51.2
2015-10-01	51.6
2016-01-01	52.4
2016-04-01	53.2
2016-07-01	53.2
2016-10-01	53.6
2017-01-01	54.2
2017-04-01	54.9
2017-07-01	54.8
2017-10-01	55.5
2018-01-01	55.9
2018-04-01	56.2