Quarterly Percent
1999-01-01 42.4
1999-04-01 42.8
1999-07-01 42.3
1999-10-01 42.1
2000-01-01 41.2
2000-04-01 39.7
2000-07-01 39.5
2000-10-01 38.9
2001-01-01 39.3
2001-04-01 38.8
2001-07-01 38.8
2001-10-01 38.4
2002-01-01 38.3
2002-04-01 38
2002-07-01 37.6
2002-10-01 36.9
2003-01-01 37.1
2003-04-01 37.2
2003-07-01 37.2
2003-10-01 37
2004-01-01 37.6
2004-04-01 38
2004-07-01 37.8
2004-10-01 37.4
2005-01-01 37.5
2005-04-01 36.8
2005-07-01 37.6
2005-10-01 36.4
2006-01-01 36.3
2006-04-01 36.4
2006-07-01 36.9
2006-10-01 37.2
2007-01-01 38
2007-04-01 37.2
2007-07-01 37
2007-10-01 36.7
2008-01-01 36
2008-04-01 35
2008-07-01 35.1
2008-10-01 35.1
2009-01-01 35.6
2009-04-01 35.6
2009-07-01 37.2
2009-10-01 37.1
2010-01-01 37
2010-04-01 36.1
2010-07-01 36
2010-10-01 36.3
2011-01-01 36.4
2011-04-01 36.4
2011-07-01 36.9
2011-10-01 36.1
2012-01-01 36.7
2012-04-01 36
2012-07-01 36.3
2012-10-01 36.6
2013-01-01 37.1
2013-04-01 36.9
2013-07-01 36.1
2013-10-01 36.6
2014-01-01 37.1
2014-04-01 36.1
2014-07-01 35.4
2014-10-01 34.4
2015-01-01 34.4
2015-04-01 33.9
2015-07-01 33.6
2015-10-01 33.2
2016-01-01 32.8
2016-04-01 33.3
2016-07-01 32.9
2016-10-01 33.0
2017-01-01 32.7
2017-04-01 32.2
2017-07-01 31.9
2017-10-01 31.9
2018-01-01 32.1
2018-04-01 31.5
2018-07-01 31.6