Quarter	Percent
1999-01-01	16.83233275659860
1999-04-01	15.47525484847780
1999-07-01	15.28002829951850
1999-10-01	15.23424219759300
2000-01-01	14.84195467039160
2000-04-01	13.78524764085100
2000-07-01	13.59889807162530
2000-10-01	13.45240576022460
2001-01-01	10.93503533678000
2001-04-01	10.34803896965740
2001-07-01	10.29096815041150
2001-10-01	10.62454897329920
2002-01-01	11.55191843305610
2002-04-01	11.14614577481960
2002-07-01	11.48725353254760
2002-10-01	11.61100707449020
2003-01-01	11.98947541861470
2003-04-01	11.28355533830300
2003-07-01	11.29766003971150
2003-10-01	11.37283309187190
2004-01-01	11.50298804780880
2004-04-01	11.09022278143730
2004-07-01	10.73654515371740
2004-10-01	10.53286045375150
2005-01-01	10.17049104874050
2005-04-01	9.31911006781923
2005-07-01	8.41051420379522
2005-10-01	8.70539788015630
2006-01-01	9.02733570927407
2006-04-01	8.44333977722544
2006-07-01	8.08361317241442
2006-10-01	8.26444028562603
2007-01-01	8.41903591374916
2007-04-01	7.93232561364582
2007-07-01	8.00634763027713
2007-10-01	8.57020551723529
2008-01-01	9.60307578999053
2008-04-01	10.35792745934020
2008-07-01	11.23068087109350
2008-10-01	13.78551377562640
2009-01-01	17.24356938710700
2009-04-01	17.77125243627060
2009-07-01	17.74950688636420
2009-10-01	18.66490996925780
2010-01-01	19.84357878000040
2010-04-01	19.88900471665870
2010-07-01	19.59204252191900
2010-10-01	20.11455655320810
2011-01-01	21.07824031044270
2011-04-01	20.64330824760720
2011-07-01	21.28393484509740
2011-10-01	22.55645192254370
2012-01-01	24.18768403533480
2012-04-01	24.39813533706550
2012-07-01	24.79237524423310
2012-10-01	25.77438742487290
2013-01-01	26.93535377803710
2013-04-01	26.05707539243100
2013-07-01	25.64750964467880
2013-10-01	25.72764824952650
2014-01-01	25.92783572730170
2014-04-01	24.47303478862630
2014-07-01	23.66898223856060
2014-10-01	23.70151301961190
2015-01-01	23.77616880791640
2015-04-01	22.37187982012120
2015-07-01	21.18299526190530
2015-10-01	20.89517655648190
2016-01-01	20.99557425178560
2016-04-01	19.99807656159160
2016-07-01	18.91081612198720
2016-10-01	18.63104999142700
2017-01-01	18.75002754116850
2017-04-01	17.22267199352330
2017-07-01	16.38082779872610
2017-10-01	16.54601361739510
2018-01-01	16.74481590450940
2018-04-01	15.28452934633140
2018-07-01	14.55325107202240