Quarterly Percent
1997-01-01 9.7
1997-04-01 9.1
1997-07-01 8.4
1997-10-01 8.3
1998-01-01 8.6
1998-04-01 8.5
1998-07-01 8.0
1998-10-01 8.4
1999-01-01 9.4
1999-04-01 10.2
1999-07-01 10.1
1999-10-01 11.1
2000-01-01 15.2
2000-04-01 11.6
2000-07-01 13
2000-10-01 13.4
2001-01-01 13.4
2001-04-01 13.2
2001-07-01 11.5
2001-10-01 10.7
2002-01-01 10.4
2002-04-01 8.7
2002-07-01 11.1
2002-10-01 9.9
2003-01-01 9.5
2003-04-01 10.4
2003-07-01 9.8
2003-10-01 9.8
2004-01-01 9.2
2004-04-01 8.8
2004-07-01 9.3
2004-10-01 9.3
2005-01-01 7.6
2005-04-01 6.2
2005-07-01 7.2
2005-10-01 6.6
2006-01-01 5.5
2006-04-01 6.3
2006-07-01 5.7
2006-10-01 4.9
2007-01-01 3.7
2007-04-01 4.2
2007-07-01 3.5
2007-10-01 3.7
2008-01-01 4.7
2008-04-01 3.5
2008-07-01 5.5
2008-10-01 6.7
2009-01-01 8.8
2009-04-01 9.7
2009-07-01 11.7
2009-10-01 11.1
2010-01-01 14.2
2010-04-01 14.4
2010-07-01 14.8
2010-10-01 13
2011-01-01 13.1
2011-04-01 12.1
2011-07-01 10.9
2011-10-01 10.2
2012-01-01 10
2012-04-01 8.6
2012-07-01 9.5
2012-10-01 8.3
2013-01-01 9.1
2013-04-01 7.9
2013-07-01 7.6
2013-10-01 8.1
2014-01-01 7.7
2014-04-01 6.2
2014-07-01 6.8
2014-10-01 6.6
2015-01-01 5.6
2015-04-01 6.5
2015-07-01 5.8
2015-10-01 6.6
2016-01-01 5.5
2016-04-01 5.2
2016-07-01 7.5
2016-10-01 6.0
2017-01-01 5.3
2017-04-01 6.2
2017-07-01 4.5
2017-10-01 5.2
2018-01-01 6.1
2018-04-01 4.8