Quarter	Percent
2005-01-01	56.7698130384958
2005-04-01	55.5012700601760
2005-07-01	54.1377864803471
2005-10-01	55.6522723499115
2006-01-01	56.8691382624264
2006-04-01	55.6318467697953
2006-07-01	54.2424832115050
2006-10-01	55.8325752546282
2007-01-01	56.7185894900797
2007-04-01	55.9694099071705
2007-07-01	54.6036287670154
2007-10-01	55.9822098717723
2008-01-01	56.9695389403941
2008-04-01	55.5896601576190
2008-07-01	54.7807317215505
2008-10-01	56.7240559097404
2009-01-01	57.5669858583564
2009-04-01	56.3820491086178
2009-07-01	55.2510039504243
2009-10-01	57.4504546936159
2010-01-01	58.2579988669022
2010-04-01	57.1734126493629
2010-07-01	55.9195488499763
2010-10-01	57.9832589743181
2011-01-01	58.6100953654817
2011-04-01	57.2419416768821
2011-07-01	56.1568439248925
2011-10-01	57.7440842521073
2012-01-01	58.7067113138807
2012-04-01	57.1286068300386
2012-07-01	56.1466329629854
2012-10-01	57.5718941696357
2013-01-01	58.3699330080412
2013-04-01	56.9894845091370
2013-07-01	56.1913340036321
2013-10-01	57.4928564141584
2014-01-01	58.3927963827677
2014-04-01	57.1972546925803
2014-07-01	56.2371934438592
2014-10-01	57.5390915559196
2015-01-01	58.4608171912649
2015-04-01	56.9936146720808
2015-07-01	56.0345010699495
2015-10-01	57.3601219683921
2016-01-01	58.1101893459521
2016-04-01	56.8516152542558
2016-07-01	55.6043553923370
2016-10-01	57.4253511003417
2017-01-01	57.9374143254637
2017-04-01	56.7917058152310
2017-07-01	55.5470157869864
2017-10-01	57.0971000990459
2018-01-01	57.6144461635304
2018-04-01	56.4681708293532