Quarter	Percent, Seasonally Adjusted
1999-04-01	47.3310152573679
1999-07-01	47.9153566366951
1999-10-01	48.3247343579610
2000-01-01	48.7517995034584
2000-04-01	49.3026940081711
2000-07-01	49.6674300754359
2000-10-01	49.8427788109386
2001-01-01	50.0199885876573
2001-04-01	50.0629749580252
2001-07-01	50.5936646589082
2001-10-01	50.7452018734990
2002-01-01	50.9436388744672
2002-04-01	51.0510117897615
2002-07-01	50.8696677013322
2002-10-01	50.8090211072419
2003-01-01	51.0024594408719
2003-04-01	51.2317991807303
2003-07-01	51.2702410238895
2003-10-01	51.5155347916306
2004-01-01	51.6096949170478
2004-04-01	51.6663415531247
2004-07-01	51.9730508235442
2004-10-01	52.7211467961445
2005-01-01	53.2336703318244
2005-04-01	53.6131924621834
2005-07-01	53.8898369882387
2005-10-01	54.0315995779006
2006-01-01	54.3830791653334
2006-04-01	54.5307567791544
2006-07-01	54.8985359160523
2006-10-01	55.2322699282219
2007-01-01	58.0013906195512
2007-04-01	58.2708177736038
2007-07-01	58.4476055626082
2007-10-01	58.4878075184348
2008-01-01	58.4951313569978
2008-04-01	57.9651456423327
2008-07-01	57.4027624130363
2008-10-01	56.7215497030723
2009-01-01	55.6079385491098
2009-04-01	54.8825636816734
2009-07-01	54.3180316282252
2009-10-01	53.7776538344328
2010-01-01	53.3841987513688
2010-04-01	52.9000187884340
2010-07-01	52.5701088317565
2010-10-01	52.0999135622457
2011-01-01	52.0286694645358
2011-04-01	52.1492033789530
2011-07-01	51.6602649506885
2011-10-01	51.7481171447128
2012-01-01	51.6674669364514
2012-04-01	51.5666517672936
2012-07-01	51.5117989194430
2012-10-01	51.7046592290073
2013-01-01	51.8677265783044
2013-04-01	52.2935991873686
2013-07-01	52.6941248660952
2013-10-01	52.5396916863581
2014-01-01	52.6816755208525
2014-04-01	52.6766581904287
2014-07-01	53.1551820189563
2014-10-01	53.4609061569620
2015-01-01	53.5688557000200
2015-04-01	53.8656442811925
2015-07-01	54.2649660873200
2015-10-01	54.7847879261739
2016-01-01	55.1952665630719
2016-04-01	55.6605332948325
2016-07-01	55.9280956123110
2016-10-01	55.9459221123491
2017-01-01	56.3701213520694
2017-04-01	56.3771639136962
2017-07-01	56.5203467233910
2017-10-01	57.0475098389935
2018-01-01	57.1056668496615
2018-04-01	57.5022627977372