Quarter	Percent, Seasonally Adjusted
1998-04-01	68.8310601623295
1999-04-01	69.6082939676435
2000-04-01	69.3344425956739
2001-04-01	70.6429220725560
2002-04-01	71.5273232984293
2003-04-01	70.7373365186055
2004-04-01	70.3158232673863
2005-04-01	70.4203486983520
2006-04-01	71.1332463733744
2007-04-01	71.5710527349118
2008-04-01	73.5296402765908
2009-04-01	73.5667076544728
2010-01-01	71.2851196450937
2010-04-01	70.9102826203663
2010-07-01	71.3873792442337
2010-10-01	71.6177468025022
2011-01-01	72.4027614251989
2011-04-01	72.7710728081842
2011-07-01	72.0855725636587
2011-10-01	72.9122535734861
2012-01-01	73.1096754117931
2012-04-01	72.8378232296979
2012-07-01	73.4354847837554
2012-10-01	72.6358398867557
2013-01-01	73.0007429320274
2013-04-01	72.9722887471061
2013-07-01	73.2650756209749
2013-10-01	73.5547157930904
2014-01-01	73.3077370623939
2014-04-01	73.8622738187956
2014-07-01	73.7924456227818
2014-10-01	75.3070877325208
2015-01-01	75.0120041971557
2015-04-01	74.4722368345449
2015-07-01	74.2619379176167
2015-10-01	75.0661739331133
2016-01-01	75.9895824325262
2016-04-01	75.0594963147786
2016-07-01	74.9349945515958
2016-10-01	75.6813366696548
2017-01-01	75.4682809708464
2017-04-01	74.7117501869258
2017-07-01	75.1022410891534
2017-10-01	75.5526555188070
2018-01-01	75.4496231139006
2018-04-01	74.8796759203668