Quarterly Percent
1998-01-01 84.4
1998-04-01 84.5
1998-07-01 84.2
1998-10-01 84.2
1999-01-01 84.3
1999-04-01 84.1
1999-07-01 84
1999-10-01 84.3
2000-01-01 84.6
2000-04-01 84.1
2000-07-01 83.8
2000-10-01 83.3
2001-01-01 83.3
2001-04-01 84
2001-07-01 82.8
2001-10-01 82.2
2002-01-01 82.7
2002-04-01 82.3
2002-07-01 81.3
2002-10-01 81.2
2003-01-01 82
2003-04-01 81
2003-07-01 80
2003-10-01 79.9
2004-01-01 80.8
2004-04-01 80.2
2004-07-01 78.7
2004-10-01 78.1
2005-01-01 78.9
2005-04-01 78.7
2005-07-01 78.7
2005-10-01 77.7
2006-01-01 78.2
2006-04-01 77.3
2006-07-01 77.3
2006-10-01 77.3
2007-01-01 77
2007-04-01 76.1
2007-07-01 76.4
2007-10-01 76.7
2008-01-01 76.6
2008-04-01 74.6
2008-07-01 75
2008-10-01 75.4
2009-01-01 74.5
2009-04-01 73.1
2009-07-01 74.2
2009-10-01 74.3
2010-01-01 73.4
2010-04-01 73.1
2010-07-01 73.1
2010-10-01 72.8
2011-01-01 71.8
2011-04-01 71.7
2011-07-01 71.1
2011-10-01 70.1
2012-01-01 68.9
2012-04-01 67.8
2012-07-01 67.6
2012-10-01 67
2013-01-01 67
2013-04-01 65.9
2013-07-01 64.6
2013-10-01 63.9
2014-01-01 63
2014-04-01 62.3
2014-07-01 61.2
2014-10-01 60.4
2015-01-01 60.7
2015-04-01 60.1
2015-07-01 60.7
2015-10-01 60.1
2016-01-01 59.3
2016-04-01 57.9
2016-07-01 58.4
2016-10-01 57.5
2017-01-01 56.5
2017-04-01 55.5
2017-07-01 55.6
2017-10-01 54.3
2018-01-01 54.1
2018-04-01 53.2