Quarter	Percent
1997-10-01	10.44603087436700
1998-01-01	8.54268255045985
1998-04-01	7.69753505899796
1998-07-01	7.63128293173880
1998-10-01	6.42351660315732
1999-01-01	5.74977279612239
1999-04-01	5.80320094842916
1999-07-01	5.75922154333560
1999-10-01	5.15315522800553
2000-01-01	4.73824107246042
2000-04-01	4.31621729921575
2000-07-01	4.35237727948873
2000-10-01	3.92145862552595
2001-01-01	3.72517022114681
2001-04-01	3.68070705375622
2001-07-01	4.29083516130758
2001-10-01	3.96180081855389
2002-01-01	4.36323970548132
2002-04-01	4.21395601411892
2002-07-01	4.62025316455696
2002-10-01	4.57757789913267
2003-01-01	4.63076840810652
2003-04-01	4.47959944604240
2003-07-01	5.26207181180355
2003-10-01	4.57581133256809
2004-01-01	4.40487347703843
2004-04-01	4.48894668400520
2004-07-01	4.82509047044632
2004-10-01	4.43513799888995
2005-01-01	4.10070857832052
2005-04-01	4.23409113471657
2005-07-01	4.62541341130230
2005-10-01	4.39273991117976
2006-01-01	4.20489296636086
2006-04-01	4.35358697709635
2006-07-01	4.90384615384615
2006-10-01	4.18497109826590
2007-01-01	4.83856931511618
2007-04-01	5.14677523034069
2007-07-01	5.04658712424638
2007-10-01	4.88584085874936
2008-01-01	5.30739366013908
2008-04-01	6.11097014294172
2008-07-01	7.56682143305308
2008-10-01	8.10787671232877
2009-01-01	10.75679902684860
2009-04-01	12.85640673308140
2009-07-01	13.57136704281160
2009-10-01	13.24791969356760
2010-01-01	13.65623048791370
2010-04-01	14.59168833458200
2010-07-01	14.85401781776480
2010-10-01	15.03156763533780
2011-01-01	14.97173863893290
2011-04-01	15.27622954474520
2011-07-01	15.89185330596950
2011-10-01	15.26275636135170
2012-01-01	15.73424992085390
2012-04-01	15.80434002869440
2012-07-01	15.81459671663100
2012-10-01	14.44775849602310
2013-01-01	14.36136507649140
2013-04-01	14.64527850401030
2013-07-01	13.65937403706480
2013-10-01	12.32316042352520
2014-01-01	12.64275157866450
2014-04-01	12.43166362949460
2014-07-01	11.95599772099750
2014-10-01	10.40966200672450
2015-01-01	10.45519203413940
2015-04-01	10.31148831918800
2015-07-01	9.83833918432800
2015-10-01	9.01950517083388
2016-01-01	8.73662984394178
2016-04-01	9.03377511757161
2016-07-01	8.51803195321439
2016-10-01	7.18359994853540
2017-01-01	7.03273040482343
2017-04-01	6.85001708233686
2017-07-01	6.89757003037462
2017-10-01	6.06685752778713
2018-01-01	5.64642902663891
2018-04-01	6.01425415746259