Quarter	Percent
1997-10-01	10.18783176806860
1998-01-01	8.54456255110384
1998-04-01	7.93212715935807
1998-07-01	7.81111657648795
1998-10-01	6.62994491737606
1999-01-01	6.03500301750151
1999-04-01	5.93371700734273
1999-07-01	5.61594202898551
1999-10-01	5.14307811291570
2000-01-01	4.82056256062076
2000-04-01	4.35536712275968
2000-07-01	4.42287953718391
2000-10-01	4.00265579057194
2001-01-01	3.73894015792979
2001-04-01	3.77714825306893
2001-07-01	4.34149449349231
2001-10-01	4.18367346938776
2002-01-01	4.65809577044904
2002-04-01	4.55094269527259
2002-07-01	4.79247671579709
2002-10-01	4.81200256152228
2003-01-01	5.00961626522575
2003-04-01	4.81894659839064
2003-07-01	5.39049991104786
2003-10-01	4.85924332078178
2004-01-01	4.75424486148347
2004-04-01	4.96074232690935
2004-07-01	5.08210890233362
2004-10-01	4.70208496903079
2005-01-01	4.44579780755177
2005-04-01	4.55678789442008
2005-07-01	4.80026575865792
2005-10-01	4.52871253976226
2006-01-01	4.34208353970612
2006-04-01	4.54099165439372
2006-07-01	4.97022628026995
2006-10-01	4.39137751422390
2007-01-01	4.87804878048780
2007-04-01	5.01579184839826
2007-07-01	5.00963391136802
2007-10-01	5.17512937823446
2008-01-01	5.92352852626825
2008-04-01	6.80307669330147
2008-07-01	8.21531845480833
2008-10-01	9.46664640632123
2009-01-01	12.93652025453980
2009-04-01	15.48277982779830
2009-07-01	15.86758877923690
2009-10-01	16.04125347084490
2010-01-01	16.59153115440350
2010-04-01	17.05426356589150
2010-07-01	17.12826243115970
2010-10-01	17.49389747762410
2011-01-01	17.53492193919470
2011-04-01	17.70062606715990
2011-07-01	17.90996261986020
2011-10-01	17.62639875847420
2012-01-01	18.05475146803410
2012-04-01	18.25552825552830
2012-07-01	17.86701349374090
2012-10-01	16.54700008252870
2013-01-01	15.72660915726610
2013-04-01	15.82031250000000
2013-07-01	14.75515463917530
2013-10-01	13.10075628202000
2014-01-01	13.58277386605530
2014-04-01	13.39829476248480
2014-07-01	12.44576570785790
2014-10-01	11.27910737386800
2015-01-01	11.36142625607780
2015-04-01	10.93525179856120
2015-07-01	10.48055643376540
2015-10-01	10.15013576106050
2016-01-01	9.78156119498876
2016-04-01	9.69339622641510
2016-07-01	9.07114010562286
2016-10-01	7.54478730960461
2017-01-01	7.25710193363571
2017-04-01	7.43509047993706
2017-07-01	7.10132568416156
2017-10-01	6.46561748972789
2018-01-01	5.76337368215541
2018-04-01	6.18970440688431