Quarter	Percent
1999-07-01	72.2838650493404
1999-10-01	73.1434103055384
2000-01-01	71.7185236381342
2000-04-01	73.4804259377095
2000-07-01	73.8779784637429
2000-10-01	73.7296991270924
2001-01-01	71.3176527359142
2001-04-01	74.2830962628905
2001-07-01	74.4570521942812
2001-10-01	74.4385076311204
2002-01-01	73.6941385052607
2002-04-01	75.3832922725557
2002-07-01	75.5034698289231
2002-10-01	75.4263082822455
2003-01-01	74.4276575708232
2003-04-01	75.3499053758932
2003-07-01	75.1560606526098
2003-10-01	75.3732982776822
2004-01-01	74.7657487639382
2004-04-01	75.6881414986818
2004-07-01	75.2361423579744
2004-10-01	75.5906452214763
2005-01-01	74.3688496722672
2005-04-01	75.6954922818056
2005-07-01	75.0190235534222
2005-10-01	74.9835449126774
2006-01-01	73.9624826689804
2006-04-01	75.3032021028280
2006-07-01	75.0419138028484
2006-10-01	74.8698236368585
2007-01-01	73.9862265321086
2007-04-01	75.3937635008170
2007-07-01	75.2138037336666
2007-10-01	75.0829344684042
2008-01-01	73.8840416687789
2008-04-01	75.2139770934270
2008-07-01	74.8402225108829
2008-10-01	74.3441542386093
2009-01-01	72.7276115314320
2009-04-01	74.2265239965358
2009-07-01	73.8495309271225
2009-10-01	73.9772054086064
2010-01-01	72.8109513076677
2010-04-01	74.5312639702178
2010-07-01	74.3626684540314
2010-10-01	74.4003449476844
2011-01-01	73.5137445935163
2011-04-01	75.0407285105024
2011-07-01	74.8092785535980
2011-10-01	75.0563107670823
2012-01-01	74.1229736224256
2012-04-01	75.5106165663493
2012-07-01	75.4414322953521
2012-10-01	75.1302011269688
2013-01-01	73.8656354137890
2013-04-01	75.5111274417519
2013-07-01	75.5131078171321
2013-10-01	75.7951712052666
2014-01-01	75.2636057824265
2014-04-01	76.1794126485870
2014-07-01	76.3702705194437
2014-10-01	76.1786022628751
2015-01-01	75.3462173419875
2015-04-01	76.2084278304500
2015-07-01	76.1715623539887
2015-10-01	76.0637096634760
2016-01-01	74.9626625408597
2016-04-01	75.9532538770459
2016-07-01	76.2873489978424
2016-10-01	76.3278422510654
2017-01-01	75.4764344953539
2017-04-01	76.6060280921138
2017-07-01	76.5844985153296
2017-10-01	76.3588690347991
2018-01-01	75.5643192327093
2018-04-01	76.1928212709263
2018-07-01	75.9525539181495