Quarter	Percent
1986-01-01	67
1986-04-01	66.8
1986-07-01	66.6
1986-10-01	66.5
1987-01-01	66.4
1987-04-01	66.4
1987-07-01	66.3
1987-10-01	66
1988-01-01	65.5
1988-04-01	65
1988-07-01	64.6
1988-10-01	64.4
1989-01-01	64
1989-04-01	63.6
1989-07-01	63.4
1989-10-01	63.4
1990-01-01	63.6
1990-04-01	63.9
1990-07-01	64
1990-10-01	63.9
1991-01-01	64
1991-04-01	64
1991-07-01	63.8
1991-10-01	63.6
1992-01-01	63.6
1992-04-01	63.4
1992-07-01	63.2
1992-10-01	63.1
1993-01-01	63.1
1993-04-01	63.2
1993-07-01	63.4
1993-10-01	63.6
1994-01-01	63.9
1994-04-01	63.9
1994-07-01	64.1
1994-10-01	64.4
1995-01-01	64.5
1995-04-01	64.5
1995-07-01	64.8
1995-10-01	65.1
1996-01-01	65.4
1996-04-01	65.7
1996-07-01	65.9
1996-10-01	65.6
1997-01-01	65.5
1997-04-01	65.6
1997-07-01	65.5
1997-10-01	65.3
1998-01-01	65.2
1998-04-01	65.2
1998-07-01	64.9
1998-10-01	64.9
1999-01-01	65.0
1999-04-01	65.1
1999-07-01	65.1
1999-10-01	65.1
2000-01-01	65.0
2000-04-01	65
2000-07-01	65.3
2000-10-01	65.5
2001-01-01	65.5
2001-04-01	65.5
2001-07-01	65.8
2001-10-01	66.3
2002-01-01	66.7
2002-04-01	66.7
2002-07-01	66.5
2002-10-01	66.2
2003-01-01	66.1
2003-04-01	66.2
2003-07-01	66.4
2003-10-01	66.5
2004-01-01	66.4
2004-04-01	66.5
2004-07-01	67
2004-10-01	67.4
2005-01-01	67.4
2005-04-01	67.6
2005-07-01	67.8
2005-10-01	68.0
2006-01-01	68.2
2006-04-01	68.4
2006-07-01	68.1
2006-10-01	68.0
2007-01-01	68.3
2007-04-01	68.5
2007-07-01	68.3
2007-10-01	68.4
2008-01-01	68.4
2008-04-01	68.4
2008-07-01	68.6
2008-10-01	68.6
2009-01-01	68.4
2009-04-01	68.0
2009-07-01	67.9
2009-10-01	67.7
2010-01-01	67.6
2010-04-01	67.7
2010-07-01	67.8
2010-10-01	67.7
2011-01-01	67.8
2011-04-01	68.0
2011-07-01	67.9
2011-10-01	67.9
2012-01-01	68.0
2012-04-01	68.1
2012-07-01	67.9
2012-10-01	67.6
2013-01-01	67.3
2013-04-01	67.6
2013-07-01	68.1
2013-10-01	68.4
2014-01-01	68.5
2014-04-01	68.5
2014-07-01	68.7
2014-10-01	69.2
2015-01-01	69.3
2015-04-01	68.9
2015-07-01	68.4
2015-10-01	68.3
2016-01-01	68.9
2016-04-01	69.6
2016-07-01	70.1
2016-10-01	70.5
2017-01-01	70.6
2017-04-01	70.6
2017-07-01	70.8
2017-10-01	70.9
2018-01-01	70.9
2018-04-01	70.9
2018-07-01	71.1