Quarterly Percent
1999-01-01 50.7
1999-04-01 50.4
1999-07-01 49.8
1999-10-01 48.9
2000-01-01 48.5
2000-04-01 48.2
2000-07-01 47.8
2000-10-01 47.5
2001-01-01 49.5
2001-04-01 49.6
2001-07-01 49
2001-10-01 48.5
2002-01-01 47.1
2002-04-01 46.3
2002-07-01 45.9
2002-10-01 45.5
2003-01-01 45
2003-04-01 44.5
2003-07-01 43.9
2003-10-01 43.5
2004-01-01 43.2
2004-04-01 42.9
2004-07-01 42.5
2004-10-01 41.9
2005-01-01 41.8
2005-04-01 41
2005-07-01 41.2
2005-10-01 40.5
2006-01-01 39.9
2006-04-01 39.3
2006-07-01 39.5
2006-10-01 38.6
2007-01-01 38.5
2007-04-01 38.3
2007-07-01 38
2007-10-01 37.6
2008-01-01 37.3
2008-04-01 36.6
2008-07-01 36.4
2008-10-01 35.4
2009-01-01 35.1
2009-04-01 34.9
2009-07-01 34.9
2009-10-01 34.7
2010-01-01 34.2
2010-04-01 33.9
2010-07-01 33.7
2010-10-01 33.3
2011-01-01 33.2
2011-04-01 32.4
2011-07-01 32.6
2011-10-01 32.5
2012-01-01 31.8
2012-04-01 31.7
2012-07-01 31.6
2012-10-01 31.4
2013-01-01 31.2
2013-04-01 31.3
2013-07-01 31.4
2013-10-01 31.1
2014-01-01 31.2
2014-04-01 31.2
2014-07-01 31.6
2014-10-01 30.8
2015-01-01 31.2
2015-04-01 30.5
2015-07-01 31.3
2015-10-01 30.8
2016-01-01 30.9
2016-04-01 30.5
2016-07-01 30.8
2016-10-01 31.0
2017-01-01 31.2
2017-04-01 31.2
2017-07-01 31.3
2017-10-01 31.0
2018-01-01 31.5
2018-04-01 31.1
2018-07-01 31.6