Quarterly Percent
1998-01-01 60.5
1998-04-01 50.3
1998-07-01 48.9
1998-10-01 59.7
1999-01-01 57.9
1999-04-01 37
1999-07-01 44.4
1999-10-01 56.9
2000-01-01 54.2
2000-04-01 36.7
2000-07-01 44.1
2000-10-01 55.9
2001-01-01 54.7
2001-04-01 37.1
2001-07-01 44.6
2001-10-01 55.3
2002-01-01 55.3
2002-04-01 37.7
2002-07-01 45.4
2002-10-01 55.8
2003-01-01 54.1
2003-04-01 38.6
2003-07-01 45.7
2003-10-01 58.9
2004-01-01 57.3
2004-04-01 40.2
2004-07-01 46.6
2004-10-01 57
2005-01-01 55.4
2005-04-01 39.8
2005-07-01 47.4
2005-10-01 54.7
2006-01-01 54
2006-04-01 39.2
2006-07-01 45
2006-10-01 54.5
2007-01-01 53.7
2007-04-01 37.9
2007-07-01 43.1
2007-10-01 51.6
2008-01-01 52.6
2008-04-01 36.1
2008-07-01 45
2008-10-01 52.4
2009-01-01 53.6
2009-04-01 37.8
2009-07-01 50.2
2009-10-01 56.7
2010-01-01 56.2
2010-04-01 40.6
2010-07-01 49.2
2010-10-01 56.6
2011-01-01 55.1
2011-04-01 38.8
2011-07-01 47.1
2011-10-01 56.9
2012-01-01 54.5
2012-04-01 38.7
2012-07-01 45.9
2012-10-01 54.6
2013-01-01 53.3
2013-04-01 37.5
2013-07-01 47.7
2013-10-01 54.2
2014-01-01 53.1
2014-04-01 37.7
2014-07-01 47.3
2014-10-01 53.6
2015-01-01 52.3
2015-04-01 37.1
2015-07-01 46.4
2015-10-01 55.5
2016-01-01 52.9
2016-04-01 38.2
2016-07-01 45.7
2016-10-01 54.4
2017-01-01 52.0
2017-04-01 37.8
2017-07-01 44.1
2017-10-01 53.2
2018-01-01 51.0
2018-04-01 36.8