Quarter	Percent
1998-04-01	14.46044413601670
1998-10-01	13.42063631569700
1999-04-01	13.78637331440740
1999-10-01	14.32000000000000
2000-04-01	14.21282798833820
2000-10-01	14.30916552667580
2001-04-01	13.82428940568480
2001-10-01	13.52523295506970
2002-01-01	13.15393300715090
2002-04-01	13.82747372236320
2002-07-01	10.95003646973010
2002-10-01	12.00616165277270
2003-01-01	11.82407407407410
2003-04-01	12.05863372361020
2003-07-01	11.80113075473390
2003-10-01	10.87057511846140
2004-01-01	12.28762971806410
2004-04-01	11.71063516867360
2004-07-01	11.17604090577060
2004-10-01	11.81030551755590
2005-01-01	11.55934107076000
2005-04-01	10.43109018739040
2005-07-01	9.46941783345615
2005-10-01	8.69324983884336
2006-01-01	8.55884781212733
2006-04-01	7.22312851187239
2006-07-01	6.01324503311258
2006-10-01	6.38067772170151
2007-01-01	7.06407802388114
2007-04-01	6.29408088563521
2007-07-01	5.64389306307880
2007-10-01	5.25346430450798
2008-01-01	6.72239331280246
2008-04-01	6.59531888975898
2008-07-01	7.39384427587410
2008-10-01	10.24629678324130
2009-01-01	14.24647824931340
2009-04-01	17.24755846250340
2009-07-01	18.78289777449440
2009-10-01	19.93691437053530
2010-01-01	21.25177809388340
2010-04-01	20.38596159303760
2010-07-01	18.53242000563010
2010-10-01	17.76485172117860
2011-01-01	17.62908947575880
2011-04-01	17.11720409345430
2011-07-01	15.08005822416300
2011-10-01	15.02229114169410
2012-01-01	16.33136094674560
2012-04-01	16.27704791344670
2012-07-01	13.68065605402800
2012-10-01	13.93173929811030
2013-01-01	12.99792428585550
2013-04-01	11.42771744545180
2013-07-01	11.77329827636580
2013-10-01	11.27426825662760
2014-01-01	11.86644006797960
2014-04-01	10.67014970360700
2014-07-01	10.58954169190390
2014-10-01	10.24623524623520
2015-01-01	10.21734714604920
2015-04-01	9.75585250678187
2015-07-01	9.70067073781159
2015-10-01	9.82867448151488
2016-01-01	10.25330507619340
2016-04-01	9.51661631419940
2016-07-01	9.54113604204568
2016-10-01	9.25397472482674
2017-01-01	9.37564181556788
2017-04-01	8.85209036083001
2017-07-01	8.52077001013171
2017-10-01	8.11691618291068
2018-01-01	8.17995910020450
2018-04-01	7.65482233502538