Quarterly Percent
1999-01-01 17.7
1999-04-01 19.1
1999-07-01 20.3
1999-10-01 20.4
2000-01-01 20.8
2000-04-01 21.9
2000-07-01 22.7
2000-10-01 23.3
2001-01-01 22.6
2001-04-01 23.1
2001-07-01 24
2001-10-01 24.2
2002-01-01 24.3
2002-04-01 25
2002-07-01 25.8
2002-10-01 27.3
2003-01-01 27.5
2003-04-01 28.9
2003-07-01 29.4
2003-10-01 30
2004-01-01 30.3
2004-04-01 30.4
2004-07-01 31.2
2004-10-01 32.3
2005-01-01 32.3
2005-04-01 32.8
2005-07-01 33.4
2005-10-01 33.5
2006-01-01 33.3
2006-04-01 33.4
2006-07-01 32.9
2006-10-01 33.1
2007-01-01 32.5
2007-04-01 32.7
2007-07-01 32.3
2007-10-01 31.4
2008-01-01 30.2
2008-04-01 30.6
2008-07-01 31.4
2008-10-01 31.4
2009-01-01 31.1
2009-04-01 31.8
2009-07-01 32
2009-10-01 32.7
2010-01-01 32.3
2010-04-01 33.4
2010-07-01 34.2
2010-10-01 34.4
2011-01-01 34.6
2011-04-01 35.1
2011-07-01 35.7
2011-10-01 35.6
2012-01-01 34.8
2012-04-01 36.4
2012-07-01 37
2012-10-01 36.4
2013-01-01 36.3
2013-04-01 37.6
2013-07-01 38.4
2013-10-01 39.3
2014-01-01 40.2
2014-04-01 41.3
2014-07-01 42.6
2014-10-01 42.9
2015-01-01 43.0
2015-04-01 45.1
2015-07-01 46.4
2015-10-01 46.7
2016-01-01 47.9
2016-04-01 49.8
2016-07-01 50.6
2016-10-01 51.1
2017-01-01 50.1
2017-04-01 51.2
2017-07-01 52.4
2017-10-01 53.0
2018-01-01 53.6
2018-04-01 53.5