Quarter	Percent
1999-07-01	67.1200046426047
1999-10-01	67.7006785298746
2000-01-01	66.1561292985532
2000-04-01	67.8421818689341
2000-07-01	66.4744378861882
2000-10-01	66.9938654423498
2001-01-01	66.1728683998048
2001-04-01	66.7266057012510
2001-07-01	66.2233033302455
2001-10-01	66.6476195099519
2002-01-01	64.4492603195643
2002-04-01	65.6270836222846
2002-07-01	65.5703164441459
2002-10-01	66.6323364986868
2003-01-01	65.1790334504230
2003-04-01	66.5913646145119
2003-07-01	65.2914707013826
2003-10-01	65.7581427745744
2004-01-01	64.4578085880918
2004-04-01	65.4186867458290
2004-07-01	64.9613474362190
2004-10-01	65.2270096156073
2005-01-01	65.2111977037320
2005-04-01	66.9616603279137
2005-07-01	66.7965725633702
2005-10-01	68.6836964253069
2006-01-01	68.2402055315927
2006-04-01	69.7139574396732
2006-07-01	69.4717843241314
2006-10-01	70.8866079779628
2007-01-01	69.8982563546784
2007-04-01	71.1645561714316
2007-07-01	70.7548884092984
2007-10-01	72.2539717347680
2008-01-01	72.1559454027670
2008-04-01	72.4103945998664
2008-07-01	72.9069405734487
2008-10-01	75.4074489209738
2009-01-01	74.9629903470904
2009-04-01	74.1715992669683
2009-07-01	73.2730878289846
2009-10-01	75.2328044832422
2010-01-01	73.9937367578578
2010-04-01	74.3024576835211
2010-07-01	73.9951405980043
2010-10-01	75.3831264336300
2011-01-01	74.3744582280356
2011-04-01	75.1445173889607
2011-07-01	74.5761754755321
2011-10-01	75.6902460550819
2012-01-01	73.9983622621840
2012-04-01	73.4749087165787
2012-07-01	72.9883257155076
2012-10-01	74.1884310629458
2013-01-01	73.8278355703311
2013-04-01	73.9610516972118
2013-07-01	73.0671287195687
2013-10-01	73.5484713678358
2014-01-01	71.5609675204279
2014-04-01	72.1966144725579
2014-07-01	70.5157575626660
2014-10-01	71.9241800446013
2015-01-01	70.1975418148713
2015-04-01	69.8872484917420
2015-07-01	69.7366017257362
2015-10-01	70.6952670776420
2016-01-01	69.8624864344431
2016-04-01	69.6518896356022
2016-07-01	69.1521701774853
2016-10-01	70.7139110045869
2017-01-01	69.7923170012526
2017-04-01	68.7841179583747
2017-07-01	69.1325631484981
2017-10-01	71.1491107743595
2018-01-01	70.1945765780031
2018-04-01	70.8353535047804
2018-07-01	70.4405984096368