Quarter	Percent
1999-07-01	60.4877839743690
1999-10-01	59.3508500436192
2000-01-01	54.1178089399687
2000-04-01	59.6451620137988
2000-07-01	59.8727207408768
2000-10-01	57.7588798995069
2001-01-01	52.8196785657870
2001-04-01	60.3725770126711
2001-07-01	60.7353815399267
2001-10-01	59.6530057517578
2002-01-01	55.9422857866343
2002-04-01	61.0394601388709
2002-07-01	61.1683147088462
2002-10-01	60.0395364092155
2003-01-01	54.2216006220659
2003-04-01	59.0992437237047
2003-07-01	58.8157652557442
2003-10-01	58.8747166640792
2004-01-01	56.2843624867000
2004-04-01	59.8825042942712
2004-07-01	59.5069324117153
2004-10-01	59.6953133900029
2005-01-01	56.0453097049596
2005-04-01	59.7511124045917
2005-07-01	58.8944539973720
2005-10-01	58.4797970259173
2006-01-01	55.4192222590780
2006-04-01	59.4692425063676
2006-07-01	58.6950128914738
2006-10-01	59.8511608628888
2007-01-01	56.6300419055153
2007-04-01	61.1014326130055
2007-07-01	60.4579824925392
2007-10-01	60.1441791466252
2008-01-01	57.4908744190208
2008-04-01	61.5706238152327
2008-07-01	61.0978260668009
2008-10-01	60.4063731390868
2009-01-01	57.2261968403692
2009-04-01	60.7527602628871
2009-07-01	60.6845808480271
2009-10-01	60.4672904730530
2010-01-01	57.0942769954766
2010-04-01	62.0856659592778
2010-07-01	61.7958681530446
2010-10-01	61.5470769094131
2011-01-01	59.0770248803334
2011-04-01	63.7964441124352
2011-07-01	63.0070525898625
2011-10-01	63.2921389172633
2012-01-01	60.4730085776846
2012-04-01	64.6168232185665
2012-07-01	63.5033210538605
2012-10-01	63.7267067532442
2013-01-01	60.8726333213771
2013-04-01	65.6540616649890
2013-07-01	65.4918821056895
2013-10-01	65.3314598565023
2014-01-01	63.3164506223720
2014-04-01	67.0463236620860
2014-07-01	66.4432083172836
2014-10-01	66.1753283161497
2015-01-01	64.2827728510931
2015-04-01	66.6732547156178
2015-07-01	66.6336583915225
2015-10-01	66.3797223711886
2016-01-01	63.9521690872940
2016-04-01	66.5317518617129
2016-07-01	67.0175324249147
2016-10-01	67.1442089571219
2017-01-01	65.6592416782409
2017-04-01	68.1337432403378
2017-07-01	67.8704157268474
2017-10-01	68.1070539718443
2018-01-01	65.6476892945457
2018-04-01	67.6475125340508
2018-07-01	67.1242931430277