Quarter	Percent
1998-01-01	17.7318761801224
1998-04-01	16.6884779516358
1998-07-01	16.9150312095822
1998-10-01	17.5323215289488
1999-01-01	18.0777028878295
1999-04-01	18.1923267462982
1999-07-01	17.8427363651434
1999-10-01	18.9682758620690
2000-01-01	18.6275588817962
2000-04-01	17.0323073564724
2000-07-01	16.6585273210701
2000-10-01	16.5965583173996
2001-01-01	16.9246316685283
2001-04-01	15.9044442053158
2001-07-01	15.4236921746649
2001-10-01	16.7506297229219
2002-01-01	17.0675275760022
2002-04-01	15.3374557370118
2002-07-01	15.1386708529566
2002-10-01	15.4434491068154
2003-01-01	15.8194451700538
2003-04-01	14.4645628556648
2003-07-01	14.6148714527634
2003-10-01	15.5726364335127
2004-01-01	17.1838068896153
2004-04-01	15.9617396502765
2004-07-01	15.8862710010936
2004-10-01	16.1912334757976
2005-01-01	16.1757363954069
2005-04-01	15.3062737924556
2005-07-01	15.1564424735156
2005-10-01	15.0909985243483
2006-01-01	14.7730061349693
2006-04-01	13.4911705718339
2006-07-01	13.0861081448403
2006-10-01	13.6926011051885
2007-01-01	14.1327727806023
2007-04-01	12.7757799591797
2007-07-01	12.3418337551100
2007-10-01	12.3797431264345
2008-01-01	12.3857471039640
2008-04-01	11.0421415062315
2008-07-01	10.8683011919760
2008-10-01	11.7604478332207
2009-01-01	13.1167096096956
2009-04-01	12.6354644834603
2009-07-01	13.1901696348856
2009-10-01	14.1813210126821
2010-01-01	15.6403883130892
2010-04-01	15.4047119197574
2010-07-01	16.2174764524853
2010-10-01	18.0829622685728
2011-01-01	19.6422687691221
2011-04-01	20.1031903815204
2011-07-01	21.6158652025748
2011-10-01	24.6761779613291
2012-01-01	26.6481707890529
2012-04-01	27.4160158087889
2012-07-01	28.9430436211673
2012-10-01	29.8300936602814
2013-01-01	31.1457491802500
2013-04-01	31.1703633789523
2013-07-01	31.3309999054016
2013-10-01	31.7479984750286
2014-01-01	31.4422257972935
2014-04-01	30.4183942706370
2014-07-01	29.2217880514100
2014-10-01	29.5855753799679
2015-01-01	30.5905085065272
2015-04-01	28.2969595224772
2015-07-01	28.1445738412286
2015-10-01	28.4025321169242
2016-01-01	29.4660329885379
2016-04-01	27.6060521674557
2016-07-01	27.1970397779834
2016-10-01	28.1216222566850
2017-01-01	27.8080903104421
2017-04-01	25.4382294136793
2017-07-01	24.9318160443901
2017-10-01	26.1051629788246
2018-01-01	26.1838573619632
2018-04-01	23.7290535756431