Quarter	Percent
1999-07-01	48.9543286600683
1999-10-01	49.7062597453236
2000-01-01	48.1449978790720
2000-04-01	50.5755041442545
2000-07-01	50.7896720659578
2000-10-01	50.7611119377177
2001-01-01	48.9756549050175
2001-04-01	51.7665265786556
2001-07-01	51.5015240741135
2001-10-01	51.7728507659692
2002-01-01	50.6019479117497
2002-04-01	52.8668710306907
2002-07-01	52.4152063117720
2002-10-01	52.1276650004531
2003-01-01	49.8976387542727
2003-04-01	51.7058561932633
2003-07-01	51.4917446793908
2003-10-01	51.5475395445835
2004-01-01	51.2045682902668
2004-04-01	52.8877627813897
2004-07-01	52.6017625656027
2004-10-01	52.6764701986552
2005-01-01	51.2787818593307
2005-04-01	52.9645874615816
2005-07-01	52.9186372517114
2005-10-01	53.1805885274278
2006-01-01	52.2005409336652
2006-04-01	53.8412895071247
2006-07-01	53.2560290336930
2006-10-01	53.5152216573549
2007-01-01	52.4252183862337
2007-04-01	53.9493239551952
2007-07-01	53.4410620342192
2007-10-01	53.6721666963100
2008-01-01	52.4686035826666
2008-04-01	54.0852722762555
2008-07-01	53.3905210067814
2008-10-01	53.2900320827359
2009-01-01	51.4398429546150
2009-04-01	52.7271459933756
2009-07-01	52.5950923227176
2009-10-01	52.4035152852651
2010-01-01	51.3435442356105
2010-04-01	53.4695509604319
2010-07-01	53.0659680041417
2010-10-01	52.8537929805738
2011-01-01	51.7360914928572
2011-04-01	53.9538357972562
2011-07-01	53.4300610446919
2011-10-01	53.4480028334242
2012-01-01	52.3857929420710
2012-04-01	54.3179929378389
2012-07-01	53.8773160463354
2012-10-01	53.6104287953021
2013-01-01	52.4092395932982
2013-04-01	54.4141907758906
2013-07-01	54.5704513388216
2013-10-01	54.5436848966600
2014-01-01	53.8852414472933
2014-04-01	55.2981581306888
2014-07-01	55.5200279097810
2014-10-01	55.3439782261431
2015-01-01	54.6321993328008
2015-04-01	55.8193886635675
2015-07-01	56.1972119336632
2015-10-01	56.2935418670953
2016-01-01	55.2203999304514
2016-04-01	56.2821084573602
2016-07-01	56.5564130337533
2016-10-01	56.4787096711626
2017-01-01	55.9241139330067
2017-04-01	57.0495721950942
2017-07-01	57.2389354602244
2017-10-01	57.2066255396958
2018-01-01	56.3729608131396
2018-04-01	57.4197825057654
2018-07-01	57.3740620673619