Quarter	Percent
1999-04-01	33.4
2000-01-01	31
2000-04-01	33.6
2000-07-01	36.9
2000-10-01	34.5
2001-01-01	35.3
2001-04-01	31.8
2001-07-01	34.4
2001-10-01	38.1
2002-01-01	37.1
2002-04-01	31
2002-07-01	37.5
2002-10-01	35.9
2003-01-01	33.1
2003-04-01	37
2003-07-01	43.9
2003-10-01	34.9
2004-01-01	31.5
2004-04-01	34.4
2004-07-01	35.3
2004-10-01	36.2
2005-01-01	32.4
2005-04-01	32.1
2005-07-01	35.5
2005-10-01	38
2006-01-01	36.2
2006-04-01	35.6
2006-07-01	37.1
2006-10-01	38.2
2007-01-01	36.5
2007-04-01	38.1
2007-07-01	40.3
2007-10-01	38
2008-01-01	38.6
2008-04-01	37.8
2008-07-01	40.3
2008-10-01	38.8
2009-01-01	30.2
2009-04-01	28.7
2009-07-01	34
2009-10-01	27
2010-01-01	23.1
2010-04-01	23.7
2010-07-01	30.7
2010-10-01	28.5
2011-01-01	31.4
2011-04-01	32.1
2011-07-01	37.5
2011-10-01	31.3
2012-01-01	30.7
2012-04-01	31.1
2012-07-01	38.7
2012-10-01	36
2013-01-01	31.2
2013-04-01	33.8
2013-07-01	38.8
2013-10-01	32.2
2014-01-01	32.5
2014-04-01	32.5
2014-07-01	34.9
2014-10-01	33.7
2015-01-01	34.8
2015-04-01	45.5
2015-07-01	44.6
2015-10-01	32.5
2016-01-01	34.4
2016-04-01	38.5
2016-07-01	43.7
2016-10-01	38.7
2017-01-01	39.4
2017-04-01	41.5
2017-07-01	43.2
2017-10-01	47.2
2018-01-01	45.7
2018-04-01	45.5