Quarter	Percent, Seasonally Adjusted
1998-04-01	64.5278450363196
1999-04-01	64.7144368059228
2000-04-01	63.2855852368048
2001-04-01	67.0812916195502
2002-04-01	64.5920117618231
2003-04-01	65.7625505591244
2004-04-01	65.2234313498495
2005-04-01	65.1425984608420
2006-04-01	65.6952908587258
2007-04-01	67.1522453450164
2008-04-01	68.4119241192412
2009-04-01	68.2648892711245
2010-01-01	66.0236563128182
2010-04-01	66.4507081867199
2010-07-01	65.7076918379918
2010-10-01	66.6759266891843
2011-01-01	67.0967753107880
2011-04-01	67.4190484667970
2011-07-01	67.3664725456868
2011-10-01	67.8134929772136
2012-01-01	67.6762021871536
2012-04-01	68.3980789068758
2012-07-01	68.6861743246225
2012-10-01	68.1517894649382
2013-01-01	69.0621767777528
2013-04-01	69.5287590610698
2013-07-01	69.2365943342272
2013-10-01	69.2496407206512
2014-01-01	68.7318284294670
2014-04-01	69.4249580943978
2014-07-01	69.0985904233752
2014-10-01	69.6911613673453
2015-01-01	70.1956371602043
2015-04-01	70.2930061384972
2015-07-01	69.7319351734652
2015-10-01	70.8759418290570
2016-01-01	70.8423036417242
2016-04-01	71.6258543620206
2016-07-01	71.6260484375858
2016-10-01	71.9409097717852
2017-01-01	71.2612897252046
2017-04-01	72.2621938797683
2017-07-01	72.1286480269014
2017-10-01	73.0603060146410
2018-01-01	72.5016317191694
2018-04-01	73.3158532894101