Quarterly Percent
1999-01-01 30.4
1999-04-01 30.2
1999-07-01 29.5
1999-10-01 29.8
2000-01-01 30
2000-04-01 29.5
2000-07-01 29.4
2000-10-01 29.4
2001-01-01 29.6
2001-04-01 29.8
2001-07-01 29.7
2001-10-01 30.3
2002-01-01 30.3
2002-04-01 30.1
2002-07-01 29.9
2002-10-01 30.3
2003-01-01 29.8
2003-04-01 28.9
2003-07-01 28.6
2003-10-01 28.6
2004-01-01 29.3
2004-04-01 29.2
2004-07-01 29
2004-10-01 28.7
2005-01-01 28.5
2005-04-01 27.9
2005-07-01 27.5
2005-10-01 27.7
2006-01-01 27.1
2006-04-01 26.9
2006-07-01 26.9
2006-10-01 26.5
2007-01-01 27
2007-04-01 27.1
2007-07-01 26.7
2007-10-01 26.3
2008-01-01 27
2008-04-01 26.9
2008-07-01 26.3
2008-10-01 26.4
2009-01-01 26.6
2009-04-01 26.6
2009-07-01 26.3
2009-10-01 26.2
2010-01-01 25.4
2010-04-01 25.3
2010-07-01 25.2
2010-10-01 26
2011-01-01 26.3
2011-04-01 25.6
2011-07-01 25.6
2011-10-01 25.1
2012-01-01 24.6
2012-04-01 23.7
2012-07-01 22.8
2012-10-01 23
2013-01-01 23.5
2013-04-01 23
2013-07-01 22.8
2013-10-01 22.3
2014-01-01 21.4
2014-04-01 21.4
2014-07-01 20.9
2014-10-01 21
2015-01-01 20.5
2015-04-01 20.5
2015-07-01 20.2
2015-10-01 20.4
2016-01-01 20.6
2016-04-01 20.2
2016-07-01 20.0
2016-10-01 19.9
2017-01-01 20.1
2017-04-01 19.7
2017-07-01 19.2
2017-10-01 19.4
2018-01-01 19.5
2018-04-01 19.0