Quarterly Percent
1999-01-01 12.3
2000-01-01 16.8
2000-04-01 16.4
2000-07-01 15.4
2000-10-01 16
2001-01-01 18.3
2001-04-01 18.4
2001-07-01 17.9
2001-10-01 18.5
2002-01-01 20.3
2002-04-01 20
2002-07-01 19.9
2002-10-01 19.8
2003-01-01 20.6
2003-04-01 19.4
2003-07-01 19.4
2003-10-01 19.3
2004-01-01 20.7
2004-04-01 19.1
2004-07-01 18.2
2004-10-01 18
2005-01-01 18.9
2005-04-01 18.1
2005-07-01 17.4
2005-10-01 16.8
2006-01-01 16.1
2006-04-01 14.1
2006-07-01 13.1
2006-10-01 12.2
2007-01-01 11.3
2007-04-01 9.6
2007-07-01 9.0
2007-10-01 8.5
2008-01-01 8.1
2008-04-01 7.1
2008-07-01 6.6
2008-10-01 6.7
2009-01-01 8.3
2009-04-01 7.9
2009-07-01 8.1
2009-10-01 8.5
2010-01-01 10.6
2010-04-01 9.6
2010-07-01 9.2
2010-10-01 9.3
2011-01-01 10.1
2011-04-01 9.5
2011-07-01 9.3
2011-10-01 9.8
2012-01-01 10.5
2012-04-01 9.9
2012-07-01 9.9
2012-10-01 10.1
2013-01-01 11.3
2013-04-01 10.5
2013-07-01 9.8
2013-10-01 9.8
2014-01-01 10.6
2014-04-01 9.1
2014-07-01 8.2
2014-10-01 8.1
2015-01-01 8.6
2015-04-01 7.4
2015-07-01 7.1
2015-10-01 6.9
2016-01-01 7.0
2016-04-01 6.2
2016-07-01 5.9
2016-10-01 5.6
2017-01-01 5.4
2017-04-01 5.0
2017-07-01 4.7
2017-10-01 4.5
2018-01-01 4.2
2018-04-01 3.6