Quarterly Percent
1998-01-01 57.5
1999-01-01 56.1
1999-04-01 56.7
1999-07-01 58.3
1999-10-01 60.2
2000-01-01 55.5
2000-04-01 55.7
2000-07-01 57.3
2000-10-01 57.1
2001-01-01 59.8
2001-04-01 56.9
2001-07-01 57.7
2001-10-01 57.1
2002-01-01 59.2
2002-04-01 57.4
2002-07-01 57.7
2002-10-01 57.1
2003-01-01 57.5
2003-04-01 56.7
2003-07-01 57.2
2003-10-01 56.9
2004-01-01 63
2004-04-01 60.6
2004-07-01 61.2
2004-10-01 61.3
2005-01-01 60.9
2005-04-01 59.8
2005-07-01 59.7
2005-10-01 58.1
2006-01-01 56.7
2006-04-01 55.6
2006-07-01 55.8
2006-10-01 55.6
2007-01-01 54.8
2007-04-01 51.1
2007-07-01 51.3
2007-10-01 52.4
2008-01-01 49.7
2008-04-01 49.1
2008-07-01 51.1
2008-10-01 50.6
2009-01-01 51.1
2009-04-01 49.2
2009-07-01 48.5
2009-10-01 49
2010-01-01 49.4
2010-04-01 48.4
2010-07-01 47.8
2010-10-01 48.9
2011-01-01 50.3
2011-04-01 49.2
2011-07-01 49.3
2011-10-01 49.8
2012-01-01 50.6
2012-04-01 47.6
2012-07-01 46.4
2012-10-01 46.4
2013-01-01 47
2013-04-01 44.5
2013-07-01 44.4
2013-10-01 43.8
2014-01-01 44.9
2014-04-01 42.5
2014-07-01 43.2
2014-10-01 42.2
2015-01-01 43.5
2015-04-01 43.5
2015-07-01 42.3
2015-10-01 41.2
2016-01-01 40.0
2016-04-01 38.5
2016-07-01 38.4
2016-10-01 38.5
2017-01-01 38.4
2017-04-01 37.0
2017-07-01 37.0
2017-10-01 35.5
2018-01-01 35.1
2018-04-01 34.1