Quarterly Percent
1998-01-01 76.0
1998-04-01 75.7
1998-07-01 76.7
1998-10-01 75.8
1999-01-01 75.5
1999-04-01 75.2
1999-07-01 76
1999-10-01 75.6
2000-01-01 75.6
2000-04-01 76.7
2000-07-01 76.5
2000-10-01 76.6
2001-01-01 75.9
2001-04-01 75.8
2001-07-01 75.1
2001-10-01 74.9
2002-01-01 73.5
2002-04-01 72.9
2002-07-01 72.5
2002-10-01 72.3
2003-01-01 71.1
2003-04-01 69.6
2003-07-01 69.3
2003-10-01 70.2
2004-01-01 68.6
2004-04-01 68.5
2004-07-01 68.7
2004-10-01 68.9
2005-01-01 67.7
2005-04-01 67.3
2005-07-01 66.3
2005-10-01 66.8
2006-01-01 65.8
2006-04-01 65.6
2006-07-01 66
2006-10-01 66.6
2007-01-01 65.3
2007-04-01 64.5
2007-07-01 64.8
2007-10-01 64.6
2008-01-01 64.1
2008-04-01 63.5
2008-07-01 64.5
2008-10-01 63.5
2009-01-01 62.7
2009-04-01 62.5
2009-07-01 62.7
2009-10-01 63.4
2010-01-01 62.2
2010-04-01 62.2
2010-07-01 62.6
2010-10-01 61.2
2011-01-01 60.4
2011-04-01 60.7
2011-07-01 60.7
2011-10-01 60.6
2012-01-01 60.2
2012-04-01 58.8
2012-07-01 58
2012-10-01 56.8
2013-01-01 56.6
2013-04-01 56.3
2013-07-01 55.5
2013-10-01 54.7
2014-01-01 54.2
2014-04-01 54.3
2014-07-01 53.1
2014-10-01 53
2015-01-01 52.3
2015-04-01 51.6
2015-07-01 51.4
2015-10-01 51.7
2016-01-01 50.3
2016-04-01 49.2
2016-07-01 48.6
2016-10-01 47.0
2017-01-01 45.8
2017-04-01 46.4
2017-07-01 45.1
2017-10-01 44.5
2018-01-01 42.9
2018-04-01 42.3