Quarterly Percent
1999-04-01 36.9
2000-04-01 35.8
2001-04-01 35.9
2002-04-01 34.7
2003-01-01 35.4
2003-04-01 35.4
2003-07-01 35.4
2003-10-01 35.4
2004-01-01 34.2
2004-04-01 34.2
2004-07-01 34.2
2004-10-01 34.2
2005-01-01 33.4
2005-04-01 33.4
2005-07-01 33.4
2005-10-01 33.4
2006-01-01 33.3
2006-04-01 33.3
2006-07-01 33.3
2006-10-01 33.3
2007-01-01 33
2007-04-01 33.8
2007-07-01 32.6
2007-10-01 33.1
2008-01-01 34.4
2008-04-01 32.2
2008-07-01 32.3
2008-10-01 33.8
2009-01-01 31.6
2009-04-01 30.8
2009-07-01 31.2
2009-10-01 31.5
2010-01-01 31.8
2010-04-01 32.6
2010-07-01 31.2
2010-10-01 31.6
2011-01-01 30.7
2011-04-01 32.6
2011-07-01 32.1
2011-10-01 32.8
2012-01-01 31.3
2012-04-01 31.5
2012-07-01 29.4
2012-10-01 30.1
2013-01-01 30.9
2013-04-01 30.3
2013-07-01 30
2013-10-01 29.4
2014-01-01 29.1
2014-04-01 29.8
2014-07-01 29.5
2014-10-01 28.4
2015-01-01 28.6
2015-04-01 29.1
2015-07-01 29.0
2015-10-01 29.8
2016-01-01 30.5
2016-04-01 30.5
2016-07-01 29.8
2016-10-01 29.3
2017-01-01 29.8
2017-04-01 30.4
2017-07-01 29.1
2017-10-01 30.0
2018-01-01 28.9
2018-04-01 30.0