Quarterly Percent
1998-01-01 34.6
1998-04-01 33.4
1998-07-01 34.0
1998-10-01 35.9
1999-01-01 35.7
1999-04-01 35.0
1999-07-01 35.7
1999-10-01 37.1
2000-01-01 35.4
2000-04-01 35.4
2000-07-01 35.1
2000-10-01 35.8
2001-01-01 35.9
2001-04-01 36.2
2001-07-01 36.8
2001-10-01 36.4
2002-01-01 34.8
2002-04-01 34.8
2002-07-01 35.5
2002-10-01 37.6
2003-01-01 36.1
2003-04-01 34.4
2003-07-01 34.2
2003-10-01 34.3
2004-01-01 36.4
2004-04-01 37.1
2004-07-01 38.4
2004-10-01 37.1
2005-01-01 37.3
2005-04-01 37.6
2005-07-01 38
2005-10-01 37.6
2006-01-01 37.9
2006-04-01 37.8
2006-07-01 36.6
2006-10-01 36.9
2007-01-01 36.6
2007-04-01 37.4
2007-07-01 36.8
2007-10-01 36.5
2008-01-01 37.2
2008-04-01 36.7
2008-07-01 36.9
2008-10-01 37.5
2009-01-01 37.3
2009-04-01 37.4
2009-07-01 37.3
2009-10-01 37.6
2010-01-01 38
2010-04-01 37.9
2010-07-01 38.2
2010-10-01 38
2011-01-01 37.1
2011-04-01 38.2
2011-07-01 38.4
2011-10-01 39.9
2012-01-01 39.4
2012-04-01 39.2
2012-07-01 40
2012-10-01 39.8
2013-01-01 39.1
2013-04-01 36.7
2013-07-01 37
2013-10-01 36.3
2014-01-01 35.6
2014-04-01 35.7
2014-07-01 36.7
2014-10-01 36.1
2015-01-01 35.6
2015-04-01 34.6
2015-07-01 35.3
2015-10-01 34.4
2016-01-01 35.5
2016-04-01 32.3
2016-07-01 31.7
2016-10-01 32.7
2017-01-01 31.9
2017-04-01 31.6
2017-07-01 30.3
2017-10-01 29.1
2018-01-01 30.7
2018-04-01 30.7