Quarterly Percent
1999-01-01 38.6
1999-04-01 38.6
1999-07-01 38.7
1999-10-01 39.1
2000-01-01 37
2000-04-01 37
2000-07-01 37.7
2000-10-01 37.5
2001-01-01 35.8
2001-04-01 34.4
2001-07-01 34.3
2001-10-01 33.1
2002-01-01 31.5
2002-04-01 31.7
2002-07-01 31.3
2002-10-01 30.3
2003-01-01 29.8
2003-04-01 29.9
2003-07-01 30.5
2003-10-01 29.1
2004-01-01 27.1
2004-04-01 26.3
2004-07-01 26.1
2004-10-01 25.7
2005-01-01 24.5
2005-04-01 23.8
2005-07-01 24.6
2005-10-01 24.6
2006-01-01 23.4
2006-04-01 24.4
2006-07-01 25
2006-10-01 25.5
2007-01-01 24.3
2007-04-01 24.7
2007-07-01 24.8
2007-10-01 23.7
2008-01-01 22.9
2008-04-01 23.4
2008-07-01 24.3
2008-10-01 22.6
2009-01-01 19.9
2009-04-01 20.2
2009-07-01 20.2
2009-10-01 19.7
2010-01-01 19
2010-04-01 19.4
2010-07-01 20.4
2010-10-01 20.8
2011-01-01 19.2
2011-04-01 19.9
2011-07-01 20.3
2011-10-01 19.4
2012-01-01 17.9
2012-04-01 18.6
2012-07-01 20.5
2012-10-01 22.2
2013-01-01 20.5
2013-04-01 22.3
2013-07-01 24.3
2013-10-01 25.1
2014-01-01 26.3
2014-04-01 26
2014-07-01 26.7
2014-10-01 26.7
2015-01-01 26.1
2015-04-01 27.6
2015-07-01 29.3
2015-10-01 29.4
2016-01-01 29.7
2016-04-01 31.5
2016-07-01 32.4
2016-10-01 32.3
2017-01-01 31.3
2017-04-01 32.6
2017-07-01 34.1
2017-10-01 33.8
2018-01-01 32.5
2018-04-01 33.5