Quarterly Percent
1998-01-01 66.9
1998-04-01 67.5
1998-07-01 67.2
1998-10-01 67.2
1999-01-01 67.0
1999-04-01 67.0
1999-07-01 67.2
1999-10-01 67.4
2000-01-01 67.4
2000-04-01 67.6
2000-07-01 68.1
2000-10-01 68.2
2001-01-01 68.2
2001-04-01 68.2
2001-07-01 68.2
2001-10-01 68.1
2002-01-01 68.1
2002-04-01 68.1
2002-07-01 67.9
2002-10-01 66.8
2003-01-01 66.2
2003-04-01 66.4
2003-07-01 66.4
2003-10-01 66.1
2004-01-01 65.8
2004-04-01 65.6
2004-07-01 65.3
2004-10-01 64.9
2005-01-01 64.5
2005-04-01 64.7
2005-07-01 64.5
2005-10-01 64.4
2006-01-01 64.7
2006-04-01 65
2006-07-01 65
2006-10-01 64.3
2007-01-01 64.4
2007-04-01 64.5
2007-07-01 64.8
2007-10-01 64.7
2008-01-01 64.7
2008-04-01 64.8
2008-07-01 64.3
2008-10-01 64
2009-01-01 62.6
2009-04-01 62.2
2009-07-01 61.2
2009-10-01 61
2010-01-01 61
2010-04-01 60.6
2010-07-01 60.7
2010-10-01 60.4
2011-01-01 59.3
2011-04-01 59.3
2011-07-01 59.3
2011-10-01 57.4
2012-01-01 56.5
2012-04-01 56.6
2012-07-01 56.1
2012-10-01 54.7
2013-01-01 53.6
2013-04-01 54.5
2013-07-01 55.3
2013-10-01 55.3
2014-01-01 54.6
2014-04-01 56.1
2014-07-01 56.9
2014-10-01 55.7
2015-01-01 55.5
2015-04-01 56.3
2015-07-01 56.7
2015-10-01 56.8
2016-01-01 55.6
2016-04-01 57.1
2016-07-01 58.0
2016-10-01 57.5
2017-01-01 57.8
2017-04-01 59.1
2017-07-01 59.8
2017-10-01 59.7
2018-01-01 59.5
2018-04-01 60.1