Quarter	Percent, Seasonally Adjusted
1999-01-01	57.5584167240292
1999-04-01	57.2468215483462
1999-07-01	57.7026758341592
1999-10-01	57.8941330389355
2000-01-01	58.8782201283125
2000-04-01	60.2399160246294
2000-07-01	60.5663348109332
2000-10-01	61.0229204633143
2001-01-01	60.8116595068221
2001-04-01	61.2128971330622
2001-07-01	61.2139184474396
2001-10-01	61.4608701053390
2002-01-01	61.7345362910766
2002-04-01	62.0196788772707
2002-07-01	62.3693191018622
2002-10-01	63.0536136502879
2003-01-01	62.9404286789686
2003-04-01	62.8154053153680
2003-07-01	62.7619384091244
2003-10-01	62.9584649206671
2004-01-01	62.4923580492606
2004-04-01	61.9507696326563
2004-07-01	62.2778539936606
2004-10-01	62.5482252642971
2005-01-01	62.5374958096953
2005-04-01	63.1485398811554
2005-07-01	62.4956104025226
2005-10-01	63.5914580549685
2006-01-01	63.6959608020499
2006-04-01	63.4947501103052
2006-07-01	63.1903761378401
2006-10-01	62.7700680460291
2007-01-01	62.0515176171066
2007-04-01	62.7573558404870
2007-07-01	63.0435591002067
2007-10-01	63.2419499073171
2008-01-01	64.0577457404342
2008-04-01	64.8546846403511
2008-07-01	64.9082436026988
2008-10-01	64.9309519467363
2009-01-01	64.4391042612033
2009-04-01	64.1885908683336
2009-07-01	62.8619521073395
2009-10-01	62.9589741899552
2010-01-01	63.1626239994005
2010-04-01	63.8358234641646
2010-07-01	63.9939186829764
2010-10-01	63.6781353256433
2011-01-01	63.7688636945083
2011-04-01	63.5851129848371
2011-07-01	63.0402836500855
2011-10-01	63.7538824878428
2012-01-01	63.3673300302136
2012-04-01	63.9415143178311
2012-07-01	63.6821352623120
2012-10-01	63.4566549116677
2013-01-01	63.0005590206964
2013-04-01	63.0740956248404
2013-07-01	63.8703762186889
2013-10-01	63.4215876730614
2014-01-01	63.0441793576493
2014-04-01	63.9780141668231
2014-07-01	64.5856763608589
2014-10-01	65.4743393508750
2015-01-01	65.6709950950985
2015-04-01	66.1461629772808
2015-07-01	66.3989391682063
2015-10-01	66.7661479060621
2016-01-01	67.2476821828729
2016-04-01	66.7053886484495
2016-07-01	67.0537116530564
2016-10-01	66.9441945199747
2017-01-01	67.3587141117020
2017-04-01	67.8021770532507
2017-07-01	68.1202109339825
2017-10-01	68.1226973519007
2018-01-01	67.9196203618636
2018-04-01	68.4133958453010
2018-07-01	68.3737928830861