Quarter	Percent, Seasonally Adjusted
1999-01-01	18.7955426119811
1999-04-01	18.8407348174402
1999-07-01	18.5275013172057
1999-10-01	17.8342909658690
2000-01-01	17.3203729949845
2000-04-01	17.5151468278403
2000-07-01	17.0897555113250
2000-10-01	16.4986293618783
2001-01-01	16.2716011725614
2001-04-01	16.2119561113939
2001-07-01	15.9615090879514
2001-10-01	15.9369442211588
2002-01-01	16.5285273874470
2002-04-01	16.3001026830602
2002-07-01	15.8175188614515
2002-10-01	15.9248227739143
2003-01-01	15.6389897217670
2003-04-01	15.4248819259636
2003-07-01	14.8474751308754
2003-10-01	14.7770530287981
2004-01-01	15.5788538378024
2004-04-01	15.7642504238523
2004-07-01	15.8494703757541
2004-10-01	16.4894890148747
2005-01-01	16.9806189046743
2005-04-01	17.8822743166469
2005-07-01	18.4044436400258
2005-10-01	18.2160438649115
2006-01-01	18.9188744005380
2006-04-01	18.6948078980501
2006-07-01	18.6970874531204
2006-10-01	18.8217657488276
2007-01-01	19.2119402184988
2007-04-01	19.6260696238758
2007-07-01	19.7780080691357
2007-10-01	18.7391699412474
2008-01-01	18.4639870989068
2008-04-01	18.1696423713294
2008-07-01	17.0861165172690
2008-10-01	17.8556319308987
2009-01-01	19.1260951072333
2009-04-01	19.4322488721480
2009-07-01	19.3728350149664
2009-10-01	19.1303378142817
2010-01-01	19.3134864139739
2010-04-01	19.4427612208206
2010-07-01	18.8488843542077
2010-10-01	18.9585508984523
2011-01-01	19.5097532167866
2011-04-01	19.8244398864144
2011-07-01	19.3723445705940
2011-10-01	19.6038853859871
2012-01-01	19.3185350849938
2012-04-01	19.4960841427448
2012-07-01	19.4518178497276
2012-10-01	20.3293045675551
2013-01-01	19.6095502420926
2013-04-01	19.9801140707964
2013-07-01	19.1689250153756
2013-10-01	19.0982719778131
2014-01-01	19.0803761255896
2014-04-01	19.5143094512924
2014-07-01	20.0750012400247
2014-10-01	19.7098601592594
2015-01-01	19.4607386186355
2015-04-01	19.5363004132328
2015-07-01	19.2859103276961
2015-10-01	18.5825160990700
2016-01-01	17.8710769493972
2016-04-01	18.1116493287906
2016-07-01	18.6588696874481
2016-10-01	19.5583127095739
2017-01-01	19.7725303845123
2017-04-01	20.6415611382327
2017-07-01	19.8147047919215
2017-10-01	20.6260590491885
2018-01-01	20.1378078996189
2018-04-01	20.9303677189189