Quarterly Percent
1998-01-01 38.0
1998-04-01 38.7
1998-07-01 37.9
1998-10-01 38.6
1999-01-01 38.1
1999-04-01 37.5
1999-07-01 38.1
1999-10-01 37.7
2000-01-01 36.2
2000-04-01 35.2
2000-07-01 36.6
2000-10-01 37.0
2001-01-01 36.2
2001-04-01 36.6
2001-07-01 38.2
2001-10-01 37.4
2002-01-01 36.7
2002-04-01 36.7
2002-07-01 36.2
2002-10-01 36.4
2003-01-01 35.3
2003-04-01 34.5
2003-07-01 34.1
2003-10-01 33.5
2004-01-01 32.5
2004-04-01 32
2004-07-01 32.2
2004-10-01 31.6
2005-01-01 30.6
2005-04-01 30.6
2005-07-01 31.1
2005-10-01 30.8
2006-01-01 30.6
2006-04-01 30.9
2006-07-01 31.2
2006-10-01 29.9
2007-01-01 30
2007-04-01 30
2007-07-01 30.4
2007-10-01 30.2
2008-01-01 29.6
2008-04-01 30.8
2008-07-01 31.1
2008-10-01 29.9
2009-01-01 30.1
2009-04-01 29.9
2009-07-01 28.9
2009-10-01 27.7
2010-01-01 27.2
2010-04-01 27.3
2010-07-01 24.9
2010-10-01 24.5
2011-01-01 25.3
2011-04-01 25.1
2011-07-01 25.1
2011-10-01 22.5
2012-01-01 21.8
2012-04-01 21.8
2012-07-01 21.7
2012-10-01 19.5
2013-01-01 18.1
2013-04-01 19.5
2013-07-01 22.8
2013-10-01 21.1
2014-01-01 20.9
2014-04-01 21.3
2014-07-01 23.5
2014-10-01 21.8
2015-01-01 20.4
2015-04-01 21.3
2015-07-01 23.0
2015-10-01 21.3
2016-01-01 22.1
2016-04-01 21.7
2016-07-01 22.7
2016-10-01 22.5
2017-01-01 23.2
2017-04-01 23.9
2017-07-01 24.6
2017-10-01 24.6
2018-01-01 24.6
2018-04-01 23.8