Quarterly Percent
1998-01-01 28
1999-01-01 29.2
1999-04-01 28.4
1999-07-01 27.4
1999-10-01 25.6
2000-01-01 29.2
2000-04-01 29.3
2000-07-01 28.1
2000-10-01 28.8
2001-01-01 27.4
2001-04-01 29.4
2001-07-01 28.4
2001-10-01 29.5
2002-01-01 28
2002-04-01 29.1
2002-07-01 29.4
2002-10-01 29.8
2003-01-01 29.1
2003-04-01 31
2003-07-01 30.4
2003-10-01 30.6
2004-01-01 25.9
2004-04-01 27.5
2004-07-01 27.2
2004-10-01 28
2005-01-01 28.5
2005-04-01 29.9
2005-07-01 30.5
2005-10-01 30.9
2006-01-01 32.1
2006-04-01 32.9
2006-07-01 33.2
2006-10-01 33.7
2007-01-01 34.4
2007-04-01 35.9
2007-07-01 36.8
2007-10-01 36.7
2008-01-01 38.8
2008-04-01 38.8
2008-07-01 39
2008-10-01 38.6
2009-01-01 38.3
2009-04-01 39.3
2009-07-01 39.7
2009-10-01 40.4
2010-01-01 40.8
2010-04-01 41.4
2010-07-01 42
2010-10-01 40.5
2011-01-01 39.6
2011-04-01 40.3
2011-07-01 40.4
2011-10-01 39.4
2012-01-01 39.7
2012-04-01 41.8
2012-07-01 42.3
2012-10-01 42.6
2013-01-01 42.1
2013-04-01 44.4
2013-07-01 44.1
2013-10-01 44.4
2014-01-01 43.5
2014-04-01 45.7
2014-07-01 45.5
2014-10-01 45.7
2015-01-01 45.1
2015-04-01 46.1
2015-07-01 46.7
2015-10-01 47.2
2016-01-01 47.9
2016-04-01 49.5
2016-07-01 49.7
2016-10-01 49.6
2017-01-01 49.7
2017-04-01 50.8
2017-07-01 51.8
2017-10-01 52.8
2018-01-01 53.4
2018-04-01 53.4