Quarterly Percent
1998-01-01 41.1
1998-04-01 40.3
1998-07-01 41.3
1998-10-01 40.7
1999-01-01 39.5
1999-04-01 39.7
1999-07-01 39.7
1999-10-01 40.3
2000-01-01 39
2000-04-01 38.7
2000-07-01 39
2000-10-01 39.3
2001-01-01 36
2001-04-01 36.4
2001-07-01 37.1
2001-10-01 36.2
2002-01-01 36.5
2002-04-01 36.2
2002-07-01 36.3
2002-10-01 35.1
2003-01-01 35.6
2003-04-01 34.9
2003-07-01 33.9
2003-10-01 33.1
2004-01-01 37.9
2004-04-01 37.3
2004-07-01 35.7
2004-10-01 35.5
2005-01-01 34.7
2005-04-01 33.8
2005-07-01 33.4
2005-10-01 32.9
2006-01-01 33.7
2006-04-01 32.3
2006-07-01 31.7
2006-10-01 31
2007-01-01 31.3
2007-04-01 30.9
2007-07-01 31.2
2007-10-01 30.5
2008-01-01 29.6
2008-04-01 30.2
2008-07-01 30.1
2008-10-01 30.3
2009-01-01 30.9
2009-04-01 30.3
2009-07-01 31.2
2009-10-01 30.2
2010-01-01 30.1
2010-04-01 29.9
2010-07-01 30.2
2010-10-01 29.8
2011-01-01 29
2011-04-01 28.7
2011-07-01 29.2
2011-10-01 29.5
2012-01-01 29.3
2012-04-01 29.1
2012-07-01 29.1
2012-10-01 29
2013-01-01 28.7
2013-04-01 28.3
2013-07-01 28.4
2013-10-01 28.2
2014-01-01 27.6
2014-04-01 28
2014-07-01 28.6
2014-10-01 27.9
2015-01-01 26.9
2015-04-01 26.0
2015-07-01 25.9
2015-10-01 25.1
2016-01-01 23.9
2016-04-01 24.6
2016-07-01 25.3
2016-10-01 24.8
2017-01-01 25.3
2017-04-01 25.6
2017-07-01 25.1
2017-10-01 24.2
2018-01-01 23.6
2018-04-01 23.7