Quarterly Percent
1999-04-01 63.7
2000-01-01 62.6
2000-04-01 61.4
2000-07-01 60.5
2000-10-01 59.6
2001-01-01 60
2001-04-01 60.1
2001-07-01 60.1
2001-10-01 59.1
2002-01-01 58.3
2002-04-01 57.1
2002-07-01 55.8
2002-10-01 55.7
2003-01-01 54.6
2003-04-01 54.5
2003-07-01 54.4
2003-10-01 54.5
2004-01-01 53.6
2004-04-01 53.7
2004-07-01 52.9
2004-10-01 52.3
2005-01-01 52.3
2005-04-01 51.9
2005-07-01 51.7
2005-10-01 51.7
2006-01-01 51.8
2006-04-01 50.7
2006-07-01 50
2006-10-01 49.2
2007-01-01 48.3
2007-04-01 47.2
2007-07-01 46.7
2007-10-01 46.8
2008-01-01 46.3
2008-04-01 45.5
2008-07-01 44.9
2008-10-01 44.3
2009-01-01 43.3
2009-04-01 43.6
2009-07-01 42.9
2009-10-01 42.8
2010-01-01 44.7
2010-04-01 44.3
2010-07-01 43.9
2010-10-01 43.5
2011-01-01 43.3
2011-04-01 42.6
2011-07-01 41.9
2011-10-01 40.6
2012-01-01 40.2
2012-04-01 39.2
2012-07-01 39.1
2012-10-01 38.2
2013-01-01 37.7
2013-04-01 36.8
2013-07-01 36.0
2013-10-01 35.6
2014-01-01 35.8
2014-04-01 35.3
2014-07-01 34.9
2014-10-01 34.5
2015-01-01 33.6
2015-04-01 32.7
2015-07-01 32.9
2015-10-01 32.4
2016-01-01 31.8
2016-04-01 31.6
2016-07-01 31.8
2016-10-01 31.3
2017-01-01 31.0
2017-04-01 30.2
2017-07-01 30.6
2017-10-01 30.1
2018-01-01 30.1
2018-04-01 29.3