Quarter	Percent
1998-01-01	75.9
1999-01-01	76.7
1999-04-01	77.6
1999-07-01	78.3
1999-10-01	77.7
2000-01-01	76.2
2000-04-01	77.7
2000-07-01	78.1
2000-10-01	77.5
2001-01-01	75.9
2001-04-01	76.7
2001-07-01	77.6
2001-10-01	76.6
2002-01-01	75.3
2002-04-01	76.4
2002-07-01	77.1
2002-10-01	76.7
2003-01-01	75.4
2003-04-01	76.5
2003-07-01	77
2003-10-01	76.6
2004-01-01	71.6
2004-04-01	73.5
2004-07-01	74.6
2004-10-01	73.6
2005-01-01	71.7
2005-04-01	73.7
2005-07-01	75.3
2005-10-01	74.3
2006-01-01	72.6
2006-04-01	74.9
2006-07-01	76.7
2006-10-01	75.6
2007-01-01	74.4
2007-04-01	76.4
2007-07-01	77.9
2007-10-01	76.6
2008-01-01	75.5
2008-04-01	77.4
2008-07-01	77.8
2008-10-01	76.7
2009-01-01	74.3
2009-04-01	75.4
2009-07-01	76.5
2009-10-01	75.9
2010-01-01	74
2010-04-01	75.8
2010-07-01	77.3
2010-10-01	76.8
2011-01-01	74.5
2011-04-01	76.3
2011-07-01	77.7
2011-10-01	76.4
2012-01-01	74.7
2012-04-01	76.6
2012-07-01	77.3
2012-10-01	76.3
2013-01-01	74.5
2013-04-01	76.4
2013-07-01	77.2
2013-10-01	75.9
2014-01-01	73.8
2014-04-01	75.3
2014-07-01	76.6
2014-10-01	75.3
2015-01-01	74.0
2015-04-01	75.0
2015-07-01	76.3
2015-10-01	75.3
2016-01-01	73.8
2016-04-01	75.3
2016-07-01	76.8
2016-10-01	75.8
2017-01-01	74.3
2017-04-01	76.2
2017-07-01	77.1
2017-10-01	77.0
2018-01-01	75.8
2018-04-01	77.7