Quarter	Percent, Seasonally Adjusted
1998-04-01	18.9647245674162
1999-04-01	19.0076956766564
2000-04-01	19.4759118635628
2001-04-01	18.8031190692301
2002-04-01	18.6897959183674
2003-04-01	18.6580733796670
2004-04-01	19.0356041491449
2005-04-01	19.1484291218175
2006-04-01	18.7518479824959
2007-04-01	18.3720201980663
2008-04-01	17.6850491143940
2009-04-01	17.4994274372089
2010-01-01	18.7706847530060
2010-04-01	18.8564228549265
2010-07-01	18.5266757194414
2010-10-01	18.6482089813171
2011-01-01	18.0508918679550
2011-04-01	18.0967974671393
2011-07-01	18.0319788549505
2011-10-01	17.6234322088541
2012-01-01	17.8455429339013
2012-04-01	17.8698148426235
2012-07-01	17.4376138226839
2012-10-01	17.7271325117667
2013-01-01	17.5863782400133
2013-04-01	17.6820747375660
2013-07-01	17.6541512303085
2013-10-01	17.4852914912827
2014-01-01	17.5553794152648
2014-04-01	17.2334325760830
2014-07-01	17.1590236891301
2014-10-01	16.5354246066848
2015-01-01	16.8417449701518
2015-04-01	16.9221325116603
2015-07-01	16.8196788955371
2015-10-01	16.2687028850022
2016-01-01	15.9087303521775
2016-04-01	16.3907644237828
2016-07-01	16.3056296434800
2016-10-01	15.9032753773540
2017-01-01	16.0138159170960
2017-04-01	16.3382968986692
2017-07-01	15.9839968732117
2017-10-01	15.8603607853644
2018-01-01	15.8552839705383
2018-04-01	16.0301144903774