Quarterly Percent
1999-01-01 51.6
1999-04-01 49.4
1999-07-01 51.5
1999-10-01 51
2000-01-01 49.7
2000-04-01 47.8
2000-07-01 50.3
2000-10-01 50.1
2001-01-01 49.2
2001-04-01 49.6
2001-07-01 51
2001-10-01 49.4
2002-01-01 48
2002-04-01 46.5
2002-07-01 47.6
2002-10-01 47.8
2003-01-01 45.9
2003-04-01 44.3
2003-07-01 45.3
2003-10-01 44.1
2004-01-01 43.3
2004-04-01 42.7
2004-07-01 43.1
2004-10-01 42.4
2005-01-01 40.8
2005-04-01 40.1
2005-07-01 40.5
2005-10-01 41.6
2006-01-01 40.2
2006-04-01 39.6
2006-07-01 40.1
2006-10-01 38.8
2007-01-01 37.6
2007-04-01 37.7
2007-07-01 39.5
2007-10-01 40.6
2008-01-01 38.8
2008-04-01 37.3
2008-07-01 37.9
2008-10-01 37.3
2009-01-01 36.2
2009-04-01 35.8
2009-07-01 38.2
2009-10-01 38.4
2010-01-01 35.6
2010-04-01 35.4
2010-07-01 37.1
2010-10-01 37.5
2011-01-01 36.6
2011-04-01 38
2011-07-01 36.8
2011-10-01 37.3
2012-01-01 37.1
2012-04-01 35.7
2012-07-01 37.8
2012-10-01 37.7
2013-01-01 38.3
2013-04-01 37.3
2013-07-01 37.6
2013-10-01 37
2014-01-01 38
2014-04-01 37.3
2014-07-01 38.1
2014-10-01 38.8
2015-01-01 38.8
2015-04-01 36.6
2015-07-01 38.9
2015-10-01 38.8
2016-01-01 38.8
2016-04-01 37.9
2016-07-01 41.0
2016-10-01 41.3
2017-01-01 40.6
2017-04-01 39.1
2017-07-01 39.2
2017-10-01 39.4
2018-01-01 39.2
2018-04-01 39.4