Quarter	Percent
1999-01-01	13.16828130606390
2000-01-01	18.51730607003010
2000-04-01	18.32243083990810
2000-07-01	17.47486620317110
2000-10-01	18.07931767564280
2001-01-01	19.76600363489500
2001-04-01	20.01681254017700
2001-07-01	19.66361612663860
2001-10-01	19.94675793877160
2002-01-01	20.99322799097070
2002-04-01	20.67690450137720
2002-07-01	21.34074427241470
2002-10-01	20.58360529852180
2003-01-01	20.85352387138680
2003-04-01	19.92708975148900
2003-07-01	20.53092816477960
2003-10-01	20.29244579335890
2004-01-01	21.27544516976320
2004-04-01	19.76664289881380
2004-07-01	19.12934496252910
2004-10-01	19.51868578958820
2005-01-01	20.04044357469020
2005-04-01	19.12321169396640
2005-07-01	19.06652549850010
2005-10-01	18.34437422269600
2006-01-01	16.77495025105100
2006-04-01	14.86304800569420
2006-07-01	14.33004158673340
2006-10-01	13.73687911858930
2007-01-01	12.07396182272560
2007-04-01	10.05614704168650
2007-07-01	9.81350198939852
2007-10-01	9.44237725428168
2008-01-01	8.67267804095796
2008-04-01	7.74726501451217
2008-07-01	7.75787698131672
2008-10-01	7.63323487864389
2009-01-01	8.88482679608151
2009-04-01	8.35517524925480
2009-07-01	8.59467361596644
2009-10-01	8.80426504188880
2010-01-01	10.65815065972770
2010-04-01	9.83977821452278
2010-07-01	9.73334711384425
2010-10-01	9.86735810705165
2011-01-01	10.13733355982700
2011-04-01	10.05169368246050
2011-07-01	10.59022401156190
2011-10-01	10.81188985910410
2012-01-01	10.97728036392770
2012-04-01	10.70863711761760
2012-07-01	10.89868111645030
2012-10-01	11.04544814971160
2013-01-01	11.90522456699440
2013-04-01	11.22521292084880
2013-07-01	10.79832576182940
2013-10-01	10.53053741262750
2014-01-01	10.99643269731250
2014-04-01	9.65572992185595
2014-07-01	8.98516305319339
2014-10-01	8.72410450045923
2015-01-01	8.75675814179927
2015-04-01	7.50054640593461
2015-07-01	7.47937625113160
2015-10-01	7.10474371219357
2016-01-01	7.00710135571336
2016-04-01	6.03231505241847
2016-07-01	6.18817308312375
2016-10-01	5.67563023036229
2017-01-01	5.35261551197806
2017-04-01	4.73722599715920
2017-07-01	4.93238176505572
2017-10-01	4.60812062241584
2018-01-01	4.26200031271173
2018-04-01	3.44711879718655