Quarter	Percent, Seasonally Adjusted
1998-04-01	18.2524271844660
1999-04-01	19.0887031544891
2000-04-01	20.6769876672789
2001-04-01	17.5344563552833
2002-04-01	21.0826918301465
2003-04-01	20.2696196437169
2004-04-01	20.9171736078615
2005-04-01	22.2247601644587
2006-04-01	22.9464285714286
2007-04-01	21.5876515986770
2008-04-01	21.0698689956332
2009-04-01	20.5194805194805
2010-01-01	22.0522344988589
2010-04-01	21.5589469235388
2010-07-01	21.6185408679353
2010-10-01	21.3347715976027
2011-01-01	20.8695071924883
2011-04-01	20.7111550513026
2011-07-01	20.6548676362146
2011-10-01	20.6565444295290
2012-01-01	20.8852996720507
2012-04-01	20.9928851742392
2012-07-01	20.2293441101870
2012-10-01	20.2502071231312
2013-01-01	20.1595251696244
2013-04-01	19.8144899330510
2013-07-01	20.2605715611031
2013-10-01	19.8566350727818
2014-01-01	21.2278292903569
2014-04-01	21.0310335459561
2014-07-01	21.2833379797827
2014-10-01	19.9531663258081
2015-01-01	19.2902977184141
2015-04-01	19.8961894734390
2015-07-01	20.4441651452324
2015-10-01	19.5325365028912
2016-01-01	20.4992010278060
2016-04-01	19.1651564771120
2016-07-01	18.7505548654884
2016-10-01	18.7646067163584
2017-01-01	18.8233025467665
2017-04-01	17.7889103425010
2017-07-01	18.2693376717285
2017-10-01	16.9015060190236
2018-01-01	17.8885747194941
2018-04-01	16.2767631436125