Quarter	Percent
1999-07-01	22.2343426179541
1999-10-01	22.3364325601798
2000-01-01	23.5278419059613
2000-04-01	22.7570569964191
2000-07-01	22.4759391679202
2000-10-01	22.6198982897813
2001-01-01	24.0787296023931
2001-04-01	22.3137217882687
2001-07-01	22.3683054327533
2001-10-01	22.4381780190956
2002-01-01	22.8726085698067
2002-04-01	21.7545813801269
2002-07-01	21.7564474260604
2002-10-01	21.8331803159037
2003-01-01	22.4242399731409
2003-04-01	21.7065170253777
2003-07-01	21.8391009822753
2003-10-01	21.5320359111308
2004-01-01	21.9394044232588
2004-04-01	21.3371906092159
2004-07-01	21.6338834966131
2004-10-01	21.1668248608605
2005-01-01	22.0497044134263
2005-04-01	21.1655076706149
2005-07-01	21.7583042630323
2005-10-01	21.9762129142436
2006-01-01	22.6015509983098
2006-04-01	21.5955196292679
2006-07-01	21.9712906903658
2006-10-01	22.1301542913563
2007-01-01	22.7201719406531
2007-04-01	21.5583225307469
2007-07-01	21.8953234101822
2007-10-01	22.1897038614574
2008-01-01	23.1280049253609
2008-04-01	21.9662340083865
2008-07-01	22.3444312337919
2008-10-01	22.7984637367301
2009-01-01	23.8461908998402
2009-04-01	22.3503482718254
2009-07-01	22.8690153182084
2009-10-01	23.0703296645536
2010-01-01	23.5473555514745
2010-04-01	22.3625102489308
2010-07-01	22.6552427299570
2010-10-01	22.8014542380160
2011-01-01	23.2174971999318
2011-04-01	22.0724679157920
2011-07-01	22.4893287981584
2011-10-01	22.3853116857923
2012-01-01	22.9547976477629
2012-04-01	21.7306121286309
2012-07-01	21.9782682610825
2012-10-01	22.4078317004781
2013-01-01	23.2170393825013
2013-04-01	21.8535721351380
2013-07-01	21.8367369057828
2013-10-01	21.8129850890935
2014-01-01	21.7181819836134
2014-04-01	20.8856003788279
2014-07-01	20.8305606282520
2014-10-01	21.1494461035628
2015-01-01	21.5359099142248
2015-04-01	20.6996280171739
2015-07-01	20.9153834097364
2015-10-01	21.3254174269979
2016-01-01	21.6571847200989
2016-04-01	20.8922309879231
2016-07-01	20.6507212335005
2016-10-01	21.0912960227620
2017-01-01	21.3067448406649
2017-04-01	20.1383267029619
2017-07-01	20.4057828543130
2017-10-01	20.8791953175422
2018-01-01	21.2307349755181
2018-04-01	20.4566217102241
2018-07-01	20.7958984496635