Quarter	Percent
1999-07-01	51.6344647193822
1999-10-01	51.9107712684412
2000-01-01	50.6383488678238
2000-04-01	52.4454986051971
2000-07-01	52.6279272985646
2000-10-01	52.5386954569726
2001-01-01	51.2450835234897
2001-04-01	53.5690743854261
2001-07-01	53.1677650285065
2001-10-01	53.4244271479494
2002-01-01	52.5517109911668
2002-04-01	54.3867615902823
2002-07-01	53.8156781115823
2002-10-01	53.4467508138554
2003-01-01	51.8371756196906
2003-04-01	53.4945150269004
2003-07-01	53.2703805998634
2003-10-01	53.3934778871393
2004-01-01	53.4257796792325
2004-04-01	54.8176538201976
2004-07-01	54.3972213302317
2004-10-01	54.4039001480840
2005-01-01	53.4589249915430
2005-04-01	54.9651263537441
2005-07-01	54.7577732059277
2005-10-01	54.9839538743427
2006-01-01	54.1378946923067
2006-04-01	55.4902413062374
2006-07-01	54.9524400048988
2006-10-01	55.1030274923346
2007-01-01	54.0751823961713
2007-04-01	55.4816255456577
2007-07-01	54.9522999101999
2007-10-01	55.1634682901018
2008-01-01	54.0641367567275
2008-04-01	55.6496541879003
2008-07-01	54.8514929642743
2008-10-01	54.7509990485027
2009-01-01	53.1565764927867
2009-04-01	54.5930528899741
2009-07-01	54.2509475668558
2009-10-01	54.0240170736863
2010-01-01	53.6108175383978
2010-04-01	55.1563128336293
2010-07-01	54.8937586818201
2010-10-01	54.5166936302304
2011-01-01	53.8546792874593
2011-04-01	55.7760554882612
2011-07-01	55.0176956037424
2011-10-01	54.9226747639148
2012-01-01	54.3196325704587
2012-04-01	56.1165269302701
2012-07-01	55.4541387273055
2012-10-01	55.0534712160973
2013-01-01	54.1787700776682
2013-04-01	56.1479562337220
2013-07-01	56.1204833057448
2013-10-01	56.0724875044324
2014-01-01	56.0346861867990
2014-04-01	57.5910449249980
2014-07-01	57.4334417056673
2014-10-01	57.2066996151550
2015-01-01	56.9474420215473
2015-04-01	58.1843743759060
2015-07-01	58.1691987578384
2015-10-01	58.1019300965392
2016-01-01	57.5901231682270
2016-04-01	58.5136396638068
2016-07-01	58.6133207223678
2016-10-01	58.4822747696167
2017-01-01	58.3492931890494
2017-04-01	59.3610692096895
2017-07-01	59.2307205413216
2017-10-01	59.0571131426508
2018-01-01	58.7593868078457
2018-04-01	59.8153247959712
2018-07-01	59.6890503593190