Quarter	Percent
1986-01-01	54.6
1986-04-01	54.6
1986-07-01	54.6
1986-10-01	54.7
1987-01-01	54.8
1987-04-01	54.8
1987-07-01	54.8
1987-10-01	54.8
1988-01-01	54.6
1988-04-01	54.3
1988-07-01	54.1
1988-10-01	53.8
1989-01-01	53.2
1989-04-01	52.8
1989-07-01	52.8
1989-10-01	53.1
1990-01-01	53.6
1990-04-01	54.1
1990-07-01	54.1
1990-10-01	54.1
1991-01-01	54.4
1991-04-01	54.6
1991-07-01	54.2
1991-10-01	53.9
1992-01-01	54
1992-04-01	54.0
1992-07-01	53.9
1992-10-01	53.9
1993-01-01	53.8
1993-04-01	53.7
1993-07-01	54
1993-10-01	54.4
1994-01-01	54.7
1994-04-01	54.8
1994-07-01	55
1994-10-01	55.4
1995-01-01	55.5
1995-04-01	55.6
1995-07-01	56
1995-10-01	56.3
1996-01-01	56.8
1996-04-01	57.4
1996-07-01	57.6
1996-10-01	57.2
1997-01-01	57.1
1997-04-01	57.3
1997-07-01	57.1
1997-10-01	56.9
1998-01-01	56.9
1998-04-01	57
1998-07-01	56.9
1998-10-01	57.0
1999-01-01	57.2
1999-04-01	57.3
1999-07-01	57.2
1999-10-01	57.3
2000-01-01	57.2
2000-04-01	57.1
2000-07-01	57.4
2000-10-01	57.7
2001-01-01	57.9
2001-04-01	58
2001-07-01	58.3
2001-10-01	58.7
2002-01-01	59.1
2002-04-01	59.1
2002-07-01	59.0
2002-10-01	58.8
2003-01-01	58.8
2003-04-01	59.1
2003-07-01	59.6
2003-10-01	59.7
2004-01-01	59.4
2004-04-01	59.3
2004-07-01	59.8
2004-10-01	60.4
2005-01-01	60.4
2005-04-01	60.7
2005-07-01	61.1
2005-10-01	61.2
2006-01-01	61.5
2006-04-01	61.7
2006-07-01	61.1
2006-10-01	61.0
2007-01-01	61.6
2007-04-01	61.8
2007-07-01	61.6
2007-10-01	61.8
2008-01-01	62.0
2008-04-01	62.0
2008-07-01	62.4
2008-10-01	62.5
2009-01-01	62.1
2009-04-01	61.9
2009-07-01	62.0
2009-10-01	61.8
2010-01-01	61.6
2010-04-01	61.7
2010-07-01	61.7
2010-10-01	61.8
2011-01-01	62.0
2011-04-01	62.2
2011-07-01	62.0
2011-10-01	62.0
2012-01-01	62.3
2012-04-01	62.6
2012-07-01	62.6
2012-10-01	62.4
2013-01-01	62.2
2013-04-01	62.3
2013-07-01	62.7
2013-10-01	63.0
2014-01-01	63.0
2014-04-01	63.1
2014-07-01	63.6
2014-10-01	64.1
2015-01-01	64.0
2015-04-01	63.5
2015-07-01	63.1
2015-10-01	63.0
2016-01-01	63.7
2016-04-01	64.3
2016-07-01	64.8
2016-10-01	65.2
2017-01-01	65.3
2017-04-01	65.3
2017-07-01	65.5
2017-10-01	65.7
2018-01-01	65.8
2018-04-01	66.0
2018-07-01	66.2