Quarter	Percent
2007-01-01	71.2659219021556
2007-04-01	71.7633934000404
2007-07-01	72.3369165437516
2007-10-01	72.7488421962341
2008-01-01	73.2831745682182
2008-04-01	72.5279743631562
2008-07-01	72.5699236129140
2008-10-01	71.5647177892362
2009-01-01	73.1762628982310
2009-04-01	74.3673821869710
2009-07-01	73.9932799055679
2009-10-01	74.5622299817376
2010-01-01	75.2590239177730
2010-04-01	75.2421001306431
2010-07-01	75.7406602141632
2010-10-01	75.5632859875052
2011-01-01	75.9950482432049
2011-04-01	76.1784259597546
2011-07-01	76.8121472508867
2011-10-01	77.2739440522588
2012-01-01	77.5321637014606
2012-04-01	77.3335230327260
2012-07-01	77.2376407158246
2012-10-01	77.2401869839082
2013-01-01	76.9913222752599
2013-04-01	77.6179337176664
2013-07-01	78.2886117053664
2013-10-01	77.6999169034381
2014-01-01	78.0757049455427
2014-04-01	78.1382580990586
2014-07-01	78.0823796951312
2014-10-01	78.5201641674668
2015-01-01	78.6251414664954
2015-04-01	78.4912384589017
2015-07-01	78.8579597435668
2015-10-01	78.6244239227469
2016-01-01	78.1130856942173
2016-04-01	78.5306802519781
2016-07-01	77.8478610442300
2016-10-01	78.6644129572073
2017-01-01	77.9896927769456
2017-04-01	78.1593541597993
2017-07-01	78.1690298053301
2017-10-01	77.6257901781022
2018-01-01	77.6731239819353
2018-04-01	77.4566204999605