Quarter	Percent
1986-01-01	32.7428729587600
1986-04-01	33.3807604141965
1986-07-01	33.6967255204013
1986-10-01	33.3950301264128
1987-01-01	33.1998901055771
1987-04-01	33.7630279758640
1987-07-01	34.0765950788249
1987-10-01	33.5881733432149
1988-01-01	34.3737837627462
1988-04-01	35.1279856842760
1988-07-01	35.8306442206757
1988-10-01	35.2904652877488
1989-01-01	35.7771147363118
1989-04-01	36.6573686657369
1989-07-01	37.0065025545750
1989-10-01	36.1689814814815
1990-01-01	36.2598500864886
1990-04-01	36.0383509108341
1990-07-01	36.5803267398707
1990-10-01	35.7265348119355
1991-01-01	35.7709384843080
1991-04-01	36.2057220708447
1991-07-01	36.5627123763498
1991-10-01	36.2086485265891
1992-01-01	36.1065266316579
1992-04-01	36.7150662375571
1992-07-01	37.3884137003698
1992-10-01	36.3917333829827
1993-01-01	36.7346938775510
1993-04-01	36.9170984455959
1993-07-01	37.1547777285482
1993-10-01	36.0322248381401
1994-01-01	35.8184349355217
1994-04-01	36.2743307891758
1994-07-01	36.3325201179769
1994-10-01	35.1599332704722
1995-01-01	35.4068885840133
1995-04-01	35.6528622314971
1995-07-01	35.5685444830925
1995-10-01	34.4516221135658
1996-01-01	34.4685535707944
1996-04-01	34.6001415428167
1996-07-01	34.2469135802469
1996-10-01	34.3085947104071
1997-01-01	34.3371808324589
1997-04-01	34.6438289262541
1997-07-01	34.8162071846282
1997-10-01	34.3628539700167
1998-01-01	34.4776274353739
1998-04-01	35.1483951214456
1998-07-01	35.4229919955838
1998-10-01	34.8111941069154
1999-01-01	34.6032291308829
1999-04-01	35.2632301462008
1999-07-01	35.3201261310666
1999-10-01	34.3566251880213
2000-01-01	34.6031854302377
2000-04-01	35.5251950529795
2000-07-01	34.9787378805919
2000-10-01	33.9712269272530
2001-01-01	34.3599810465038
2001-04-01	34.6359272530593
2001-07-01	34.6186255013651
2001-10-01	33.2394649502162
2002-01-01	33.0300606545358
2002-04-01	33.7611940298508
2002-07-01	33.8658568787959
2002-10-01	33.2994357695840
2003-01-01	33.6037797328120
2003-04-01	34.3022878994102
2003-07-01	33.7999548430797
2003-10-01	33.0841301418212
2004-01-01	33.2982153688983
2004-04-01	33.8708651399491
2004-07-01	33.3998985672626
2004-10-01	31.8407018208211
2005-01-01	32.3215183509301
2005-04-01	32.9657937601804
2005-07-01	32.3019763339474
2005-10-01	31.7026170199540
2006-01-01	31.3659985152190
2006-04-01	31.9680965725372
2006-07-01	32.2658888547743
2006-10-01	31.6710518264700
2007-01-01	31.2709642007684
2007-04-01	31.8500030437694
2007-07-01	32.1869113447165
2007-10-01	31.1602544683429
2008-01-01	32.3102021086976
2008-04-01	31.9470414379637
2008-07-01	31.9806123370563
2008-10-01	30.6031765094425
2009-01-01	31.7728755724505
2009-04-01	32.0287778374828
2009-07-01	32.6804584015478
2009-10-01	31.7586002372479
2010-01-01	32.2044917257683
2010-04-01	32.4978621767464
2010-07-01	32.5603978459818
2010-10-01	32.0424807838996
2011-01-01	31.7190929041697
2011-04-01	32.3144360023378
2011-07-01	32.4782583318742
2011-10-01	31.7222303100888
2012-01-01	31.5356675868081
2012-04-01	32.2913945726310
2012-07-01	32.5334028925021
2012-10-01	33.0750773322541
2013-01-01	32.3772736444611
2013-04-01	32.7878753019671
2013-07-01	32.2926521602018
2013-10-01	31.2901292697543
2014-01-01	31.0420215786485
2014-04-01	32.0434180399695
2014-07-01	31.8827533826549
2014-10-01	30.3545464713119
2015-01-01	30.3412978776668
2015-04-01	31.3616503511974
2015-07-01	32.1906124470368
2015-10-01	31.3589897775105
2016-01-01	30.8072308778025
2016-04-01	30.5356662180350
2016-07-01	30.4303580514716
2016-10-01	29.0827323771255
2017-01-01	28.9891085968066
2017-04-01	30.2156192479621
2017-07-01	29.4109951068896
2017-10-01	28.6896336386345
2018-01-01	28.7886624599152
2018-04-01	29.3701253571520
2018-07-01	29.4108598677127