Quarter	Net Percent, Seasonally Adjusted
1998-01-01	-32
1998-04-01	-38
1998-07-01	-44
1998-10-01	-46
1999-01-01	-45
1999-04-01	-30
1999-07-01	-27
1999-10-01	-28
2000-01-01	-29
2000-04-01	-27
2000-07-01	-29
2000-10-01	-25
2001-01-01	-22
2001-04-01	-23
2001-07-01	-23
2001-10-01	-19
2002-01-01	-26
2002-04-01	-29
2002-07-01	-26
2002-10-01	-28
2003-01-01	-24
2003-04-01	-21
2003-07-01	-23
2003-10-01	-23
2004-01-01	-19
2004-04-01	-18
2004-07-01	-23
2004-10-01	-19
2005-01-01	-9
2005-04-01	-11
2005-07-01	-10
2005-10-01	-12
2006-01-01	-8
2006-04-01	-1
2006-07-01	-18
2006-10-01	-5
2007-01-01	-2
2007-04-01	-1
2007-07-01	-1
2007-10-01	0
2008-01-01	4
2008-04-01	2
2008-07-01	2
2008-10-01	-1
2009-01-01	-18
2009-04-01	-21
2009-07-01	-20
2009-10-01	-17
2010-01-01	-15
2010-04-01	-16
2010-07-01	-11
2010-10-01	-10
2011-01-01	-7
2011-04-01	-9
2011-07-01	-8
2011-10-01	-6
2012-01-01	-6
2012-04-01	-10
2012-07-01	-7
2012-10-01	-5
2013-01-01	-5
2013-04-01	-8
2013-07-01	-4
2013-10-01	-3
2014-01-01	-3
2014-04-01	-8
2014-07-01	-6
2014-10-01	-6
2015-01-01	-8
2015-04-01	-10
2015-07-01	-9
2015-10-01	-8
2016-01-01	-16
2016-04-01	-19
2016-07-01	-16
2016-10-01	-16
2017-01-01	-16
2017-04-01	-20
2017-07-01	-16
2017-10-01	-15
2018-01-01	-20
2018-04-01	-22
2018-07-01	-20