Quarter	Percent, Seasonally Adjusted
1998-04-01	21.4557712716150
1999-04-01	22.3414877683475
2000-04-01	22.0214356929212
2001-04-01	20.5115439666438
2002-04-01	19.3797969794504
2003-04-01	19.4606907590962
2004-04-01	19.2156622069473
2005-04-01	18.7026167767180
2006-04-01	18.7995124923827
2007-04-01	18.0991083884272
2008-04-01	16.4033875908463
2009-04-01	16.0968660968661
2010-01-01	18.4609768258459
2010-04-01	17.9981860490970
2010-07-01	17.8832477527524
2010-10-01	17.8821370864230
2011-01-01	17.2664758461523
2011-04-01	17.3480947370975
2011-07-01	17.5220303456745
2011-10-01	16.4471649022582
2012-01-01	16.6905990942883
2012-04-01	16.4541927089244
2012-07-01	16.2735182641371
2012-10-01	16.1073529305906
2013-01-01	16.4290618283034
2013-04-01	16.4788392080638
2013-07-01	16.5146881127389
2013-10-01	16.3148581184182
2014-01-01	15.8580034705797
2014-04-01	15.5436705104017
2014-07-01	15.3069550400188
2014-10-01	14.3143330101842
2015-01-01	15.0706559892571
2015-04-01	14.9874516861928
2015-07-01	15.5403813460793
2015-10-01	15.0940975223590
2016-01-01	13.4834416030183
2016-04-01	14.9762941557034
2016-07-01	15.1921680521020
2016-10-01	14.2656019702853
2017-01-01	13.9794984917589
2017-04-01	14.7794713401388
2017-07-01	14.6847865497299
2017-10-01	14.3560957278523
2018-01-01	13.9566213061243
2018-04-01	13.9399496445235