Quarter	Percent
1999-07-01	71.0726523296304
1999-10-01	72.0632592896419
2000-01-01	71.1205812529866
2000-04-01	72.6464247104052
2000-07-01	70.8850892529202
2000-10-01	71.4845542392269
2001-01-01	71.5784178778331
2001-04-01	72.2024054921741
2001-07-01	71.7258634724025
2001-10-01	72.5565032496999
2002-01-01	70.3407136111769
2002-04-01	71.4242822430982
2002-07-01	71.0092460631253
2002-10-01	72.0827699247406
2003-01-01	71.6206827607812
2003-04-01	72.7452325373379
2003-07-01	71.0946693505372
2003-10-01	70.5248866001516
2004-01-01	70.0840087385466
2004-04-01	71.4558810320377
2004-07-01	71.0061834567742
2004-10-01	70.2297263011861
2005-01-01	71.1096963797236
2005-04-01	72.9844877852954
2005-07-01	72.5089862765394
2005-10-01	74.1115626644300
2006-01-01	73.4791959783690
2006-04-01	74.9639681234431
2006-07-01	74.4897987337234
2006-10-01	76.0044279052096
2007-01-01	75.1011435293047
2007-04-01	76.2639612612961
2007-07-01	75.5923598084039
2007-10-01	77.1583246825847
2008-01-01	78.0825312665579
2008-04-01	78.3970692288861
2008-07-01	78.3005123474542
2008-10-01	80.8618098251956
2009-01-01	80.7789884693202
2009-04-01	79.7979779705818
2009-07-01	78.4597799652166
2009-10-01	80.2615852203794
2010-01-01	79.9383930850986
2010-04-01	80.5793165910466
2010-07-01	79.6034743324620
2010-10-01	80.0671177681508
2011-01-01	78.7800737962028
2011-04-01	79.3831474788679
2011-07-01	78.7481330206551
2011-10-01	79.1890116166955
2012-01-01	77.8973113866330
2012-04-01	78.3473150885076
2012-07-01	77.3052036836669
2012-10-01	78.7842787053424
2013-01-01	78.3132761931708
2013-04-01	78.4459487637552
2013-07-01	76.9442072202331
2013-10-01	77.3342765607122
2014-01-01	75.2388142652441
2014-04-01	76.7240930246268
2014-07-01	74.4126135844248
2014-10-01	76.0297097326687
2015-01-01	74.0496280216277
2015-04-01	74.0607545104117
2015-07-01	74.0143136259346
2015-10-01	74.9553204873930
2016-01-01	74.4362697729440
2016-04-01	73.9211302974195
2016-07-01	73.3964163801019
2016-10-01	75.1117634142448
2017-01-01	74.4780157684057
2017-04-01	72.9984213574560
2017-07-01	73.1803268434676
2017-10-01	75.1314167531310
2018-01-01	74.7411182050420
2018-04-01	76.1334650992849
2018-07-01	75.3727251926648