Quarter	Percent, Seasonally Adjusted
1993-01-01	54.5
1993-04-01	53.2
1993-07-01	49.3
1993-10-01	50.0
1994-01-01	49.5
1994-04-01	49.3
1994-07-01	51.2
1994-10-01	48.0
1995-01-01	44.5
1995-04-01	44.2
1995-07-01	44.2
1995-10-01	44.1
1996-01-01	45.5
1996-04-01	46.0
1996-07-01	46.2
1996-10-01	48.0
1997-01-01	50.6
1997-04-01	49.3
1997-07-01	50.3
1997-10-01	52.0
1998-01-01	52.5
1998-04-01	53.4
1998-07-01	54.3
1998-10-01	51.9
1999-01-01	52.6
1999-04-01	51.3
1999-07-01	51.3
1999-10-01	50.8
2000-01-01	51.3
2000-04-01	52.6
2000-07-01	54.6
2000-10-01	56.0
2001-01-01	57.2
2001-04-01	58.8
2001-07-01	63.7
2001-10-01	62.6
2002-01-01	62.2
2002-04-01	62.8
2002-07-01	64.1
2002-10-01	65.2
2003-01-01	64.7
2003-04-01	68.4
2003-07-01	65.7
2003-10-01	68.8
2004-01-01	68.2
2004-04-01	68.4
2004-07-01	69.1
2004-10-01	68.6
2005-01-01	70.2
2005-04-01	69.5
2005-07-01	70.1
2005-10-01	72.7
2006-01-01	72.5
2006-04-01	73.4
2006-07-01	73.6
2006-10-01	73.2
2007-01-01	74.6
2007-04-01	74.1
2007-07-01	73.2
2007-10-01	72.2
2008-01-01	72.6
2008-04-01	71.6
2008-07-01	70.6
2008-10-01	69.3
2009-01-01	64.9
2009-04-01	60.6
2009-07-01	60.0
2009-10-01	59.9
2010-01-01	61.7
2010-04-01	63.2
2010-07-01	65.7
2010-10-01	66.8
2011-01-01	69.8
2011-04-01	71.5
2011-07-01	70.6
2011-10-01	71.2
2012-01-01	72.1
2012-04-01	72.7
2012-07-01	71.3
2012-10-01	72.2
2013-01-01	72.0
2013-04-01	73.4
2013-07-01	73.5
2013-10-01	74.0
2014-01-01	74.2
2014-04-01	75.1
2014-07-01	75.1
2014-10-01	75.1
2015-01-01	74.4
2015-04-01	74.4
2015-07-01	73.6
2015-10-01	74.3
2016-01-01	75.9
2016-04-01	76.1
2016-07-01	75.5
2016-10-01	76.0
2017-01-01	76.5
2017-04-01	77.4
2017-07-01	77.6
2017-10-01	77.4
2018-01-01	77.8
2018-04-01	77.5
2018-07-01	77.2
2018-10-01	77.4