Quarter	Percent
1999-07-01	64.5536341868977
1999-10-01	64.6442967160002
2000-01-01	63.4085600691754
2000-04-01	64.7059884024045
2000-07-01	64.9494866545993
2000-10-01	64.8412475808965
2001-01-01	63.4607214159678
2001-04-01	65.5073185305957
2001-07-01	65.2840953507063
2001-10-01	65.3826982419644
2002-01-01	64.7326422060102
2002-04-01	66.2136266823672
2002-07-01	65.9279715738194
2002-10-01	65.7068311366359
2003-01-01	64.6075387999651
2003-04-01	65.8055807910320
2003-07-01	65.6315834233570
2003-10-01	65.8487002494106
2004-01-01	65.6690023222631
2004-04-01	66.6708718413822
2004-07-01	66.3179830679274
2004-10-01	66.5548479009771
2005-01-01	65.6409558230615
2005-04-01	66.8398223259741
2005-07-01	66.4446900499929
2005-10-01	66.4560139724557
2006-01-01	65.7274385444169
2006-04-01	66.9161497914638
2006-07-01	66.4698942662374
2006-10-01	66.4703623152334
2007-01-01	65.6670986199220
2007-04-01	66.9579188279671
2007-07-01	66.5318864897965
2007-10-01	66.4957016598525
2008-01-01	65.4821399574662
2008-04-01	66.8574746470839
2008-07-01	66.2730130318974
2008-10-01	65.9958312786073
2009-01-01	64.6820829317974
2009-04-01	66.1456935340997
2009-07-01	65.7171152261201
2009-10-01	65.5017665925857
2010-01-01	65.0660153014436
2010-04-01	66.4290088416478
2010-07-01	66.1550630335426
2010-10-01	65.8959197673959
2011-01-01	65.3616099193706
2011-04-01	66.8943653148577
2011-07-01	66.3073905131535
2011-10-01	66.3138926546761
2012-01-01	65.7307613379300
2012-04-01	67.2390450909185
2012-07-01	66.7829310291548
2012-10-01	66.3678363115551
2013-01-01	65.5306845476930
2013-04-01	67.1954453890684
2013-07-01	67.1940666541869
2013-10-01	67.1864914243087
2014-01-01	67.2187820414781
2014-04-01	68.4144682739734
2014-07-01	68.3668941196128
2014-10-01	68.0953807240559
2015-01-01	67.7751919723910
2015-04-01	68.8143839432762
2015-07-01	68.6991120560163
2015-10-01	68.4584963086475
2016-01-01	68.0359627302984
2016-04-01	68.8807885033341
2016-07-01	69.0516251282554
2016-10-01	68.7661523577904
2017-01-01	68.5963155671596
2017-04-01	69.6893371192048
2017-07-01	69.4895908091082
2017-10-01	69.1674509377968
2018-01-01	68.8408969057970
2018-04-01	69.7540201133869
2018-07-01	69.5237116936731