Quarter	Percent
1999-07-01	56.9054877030528
1999-10-01	57.7849333562710
2000-01-01	56.0909985942536
2000-04-01	58.1905363686462
2000-07-01	58.2159335184514
2000-10-01	58.7805185687088
2001-01-01	57.0635465655520
2001-04-01	59.2467932169900
2001-07-01	58.3767354375740
2001-10-01	59.0329844407063
2002-01-01	57.8295416848412
2002-04-01	59.9063233714678
2002-07-01	59.2404299093045
2002-10-01	59.3228064163929
2003-01-01	57.2455610056914
2003-04-01	59.0722599113187
2003-07-01	58.3701681259779
2003-10-01	59.0671992029231
2004-01-01	58.9392213230022
2004-04-01	60.4010600652994
2004-07-01	59.6488305319827
2004-10-01	60.1415067595900
2005-01-01	59.0364611423856
2005-04-01	60.6086834197364
2005-07-01	60.4133107894893
2005-10-01	61.5192951362253
2006-01-01	60.6730152165720
2006-04-01	62.0645864279092
2006-07-01	61.5064007868224
2006-10-01	61.9474870471205
2007-01-01	61.0430521273586
2007-04-01	62.4931157456497
2007-07-01	61.8869392998806
2007-10-01	62.6670762879193
2008-01-01	61.4795707919849
2008-04-01	62.8980797406358
2008-07-01	62.1041112814814
2008-10-01	62.7255729256482
2009-01-01	60.9526400847135
2009-04-01	61.9263253541463
2009-07-01	61.4184491470669
2009-10-01	61.8765024802124
2010-01-01	61.2236681246502
2010-04-01	62.5703891022662
2010-07-01	62.3876951274336
2010-10-01	62.5120511852957
2011-01-01	61.8166985198938
2011-04-01	63.7893395390071
2011-07-01	62.4924374655011
2011-10-01	62.8485578868101
2012-01-01	62.1017817818839
2012-04-01	63.5185281630135
2012-07-01	62.9654469522723
2012-10-01	62.7932355129272
2013-01-01	61.9095147075340
2013-04-01	63.7883693043563
2013-07-01	63.8500417523471
2013-10-01	64.0357587267723
2014-01-01	63.8281323073115
2014-04-01	65.2747552817700
2014-07-01	64.8940561098039
2014-10-01	65.0136741350630
2015-01-01	64.5966836286171
2015-04-01	65.6157668068418
2015-07-01	65.5050014942013
2015-10-01	65.7984134672040
2016-01-01	65.3632658264414
2016-04-01	66.0293711289198
2016-07-01	66.0500024467479
2016-10-01	66.3350675882005
2017-01-01	66.2374597101813
2017-04-01	66.8534470313806
2017-07-01	66.6509525221374
2017-10-01	66.8215563479970
2018-01-01	66.6805210125000
2018-04-01	67.7043801399148
2018-07-01	67.5354919156999