Quarter	Percent
1999-07-01	57.8135764629637
1999-10-01	58.4410041178954
2000-01-01	56.5943884855651
2000-04-01	59.0636620491939
2000-07-01	59.3488887783604
2000-10-01	58.9854806010199
2001-01-01	56.6388602845785
2001-04-01	59.8672424624082
2001-07-01	59.8619175684342
2001-10-01	59.7811377172378
2002-01-01	58.4704838845487
2002-04-01	60.8330924709457
2002-07-01	60.6587487319262
2002-10-01	60.2786038036846
2003-01-01	58.2486270287460
2003-04-01	59.9052465186736
2003-07-01	59.7390013481066
2003-10-01	59.6996697732147
2004-01-01	58.9892831443750
2004-04-01	60.6565114072228
2004-07-01	60.2594384080506
2004-10-01	60.2900340605751
2005-01-01	58.7097737693504
2005-04-01	60.6271479529236
2005-07-01	60.1686733407338
2005-10-01	60.0635690944733
2006-01-01	58.7622012826492
2006-04-01	60.7365655086378
2006-07-01	60.3500443057719
2006-10-01	60.2375476862739
2007-01-01	58.9169523180448
2007-04-01	60.8811023044406
2007-07-01	60.4743446379363
2007-10-01	60.2645563326446
2008-01-01	58.7212981942850
2008-04-01	60.6286558346750
2008-07-01	60.1179174000192
2008-10-01	59.6189022729709
2009-01-01	57.5550045737299
2009-04-01	59.4486640555221
2009-07-01	59.2806174312779
2009-10-01	58.8158775302902
2010-01-01	57.1387068540790
2010-04-01	59.7889162282396
2010-07-01	59.5001003776172
2010-10-01	59.0383559913204
2011-01-01	57.5756665489424
2011-04-01	60.1512475381822
2011-07-01	59.7588217132628
2011-10-01	59.5496279186152
2012-01-01	58.0913390139414
2012-04-01	60.5164879463563
2012-07-01	60.2544408886651
2012-10-01	59.6106901945217
2013-01-01	57.9423579131404
2013-04-01	60.4675058497471
2013-07-01	60.5115290570370
2013-10-01	60.2851392003303
2014-01-01	59.1580567821897
2014-04-01	61.0467405822688
2014-07-01	61.1895805542642
2014-10-01	60.6567774576808
2015-01-01	59.2922012043917
2015-04-01	60.9834114375860
2015-07-01	61.1240506751327
2015-10-01	60.7602168650774
2016-01-01	59.2269550362659
2016-04-01	60.9416390337514
2016-07-01	61.2094585887027
2016-10-01	60.8699124990702
2017-01-01	59.5642457370158
2017-04-01	61.3191006356636
2017-07-01	61.4054698669975
2017-10-01	61.0447046192133
2018-01-01	59.6149155727171
2018-04-01	61.2108566496178
2018-07-01	61.1040901036717