Quarterly Percent
1998-01-01 42.7
1998-04-01 42.6
1998-07-01 42.2
1998-10-01 42.9
1999-01-01 42.1
1999-04-01 42.1
1999-07-01 42.9
1999-10-01 43.7
2000-01-01 42.1
2000-04-01 41.1
2000-07-01 42.6
2000-10-01 43.1
2001-01-01 42.4
2001-04-01 42.4
2001-07-01 43.9
2001-10-01 42.9
2002-01-01 42.3
2002-04-01 42.2
2002-07-01 42.1
2002-10-01 41.9
2003-01-01 40.1
2003-04-01 38.8
2003-07-01 38.4
2003-10-01 37.2
2004-01-01 36.6
2004-04-01 36.6
2004-07-01 36.9
2004-10-01 36
2005-01-01 35.3
2005-04-01 35.3
2005-07-01 35.6
2005-10-01 34.9
2006-01-01 34.8
2006-04-01 35.2
2006-07-01 35.1
2006-10-01 34
2007-01-01 33.9
2007-04-01 34.2
2007-07-01 35.1
2007-10-01 34.4
2008-01-01 34.3
2008-04-01 34.7
2008-07-01 34.1
2008-10-01 33.2
2009-01-01 31.7
2009-04-01 31.2
2009-07-01 31.1
2009-10-01 29.4
2010-01-01 28.5
2010-04-01 28.4
2010-07-01 27.3
2010-10-01 27.3
2011-01-01 27.3
2011-04-01 26.6
2011-07-01 27.7
2011-10-01 24.7
2012-01-01 23.4
2012-04-01 23.4
2012-07-01 23.8
2012-10-01 21.5
2013-01-01 20
2013-04-01 21.2
2013-07-01 23.3
2013-10-01 22.2
2014-01-01 21.4
2014-04-01 21.2
2014-07-01 24.7
2014-10-01 22.2
2015-01-01 21.9
2015-04-01 22.3
2015-07-01 24.2
2015-10-01 22.8
2016-01-01 22.9
2016-04-01 23.6
2016-07-01 24.9
2016-10-01 24.2
2017-01-01 25.0
2017-04-01 25.2
2017-07-01 26.7
2017-10-01 26.6
2018-01-01 26.0
2018-04-01 26.4