Quarter	Percent, Seasonally Adjusted
1999-01-01	59.2518369888263
1999-04-01	59.5765702333800
1999-07-01	60.2788059975290
1999-10-01	60.6308451993681
2000-01-01	61.0503916828021
2000-04-01	61.5349313436063
2000-07-01	62.0256079178702
2000-10-01	62.1700977533026
2001-01-01	63.6928642438674
2001-04-01	65.2454332561937
2001-07-01	65.9379881958319
2001-10-01	66.7087782034577
2002-01-01	67.0730360439662
2002-04-01	67.0179307929110
2002-07-01	67.4239932918506
2002-10-01	67.9164378174659
2003-01-01	67.6807540869499
2003-04-01	68.7458518188515
2003-07-01	69.3321988356645
2003-10-01	70.4816573948880
2004-01-01	70.9693311549639
2004-04-01	72.0927223200246
2004-07-01	72.8164405226233
2004-10-01	72.5064011141756
2005-01-01	72.2983136176494
2005-04-01	72.7630231350939
2005-07-01	73.2953791001041
2005-10-01	73.3538599061547
2006-01-01	73.4964790251397
2006-04-01	73.5501742031596
2006-07-01	72.9391372566424
2006-10-01	73.1231087506022
2007-01-01	73.5507752732573
2007-04-01	74.2906184710193
2007-07-01	74.4413222238746
2007-10-01	74.8031116244592
2008-01-01	74.8963438751380
2008-04-01	75.1062227040662
2008-07-01	74.4693582328662
2008-10-01	75.0280564988766
2009-01-01	75.8339563081605
2009-04-01	75.0624820315398
2009-07-01	75.2668822099674
2009-10-01	75.1916570480469
2010-01-01	75.0698391606222
2010-04-01	75.0593650196010
2010-07-01	75.5386494596151
2010-10-01	75.1389150086345
2011-01-01	75.4159162856932
2011-04-01	75.6886903994816
2011-07-01	75.5710938463234
2011-10-01	76.1786431726232
2012-01-01	75.6240610205781
2012-04-01	74.8501500064096
2012-07-01	73.8804516683433
2012-10-01	72.8604751515258
2013-01-01	73.1969958037539
2013-04-01	73.0532550072622
2013-07-01	72.0721347480870
2013-10-01	72.1217728988672
2014-01-01	70.7914730733414
2014-04-01	70.4033573697389
2014-07-01	70.4864046938159
2014-10-01	70.2317024132782
2015-01-01	69.7445384527840
2015-04-01	68.7745152952332
2015-07-01	68.7183422202852
2015-10-01	68.6658436799338
2016-01-01	68.0887512073284
2016-04-01	67.8767303913091
2016-07-01	67.4607358864968
2016-10-01	67.4042568116476
2017-01-01	67.5653605933588
2017-04-01	67.0117761251928
2017-07-01	67.8526378326225
2017-10-01	67.8229494203473
2018-01-01	68.2260674700044
2018-04-01	67.7064966947522