Quarter	Percent
1997-10-01	10.82966782951620
1998-01-01	8.52423250740221
1998-04-01	7.33916302311056
1998-07-01	7.35950044603033
1998-10-01	6.10780271797221
1999-01-01	5.31769008075575
1999-04-01	5.62426383981154
1999-07-01	5.96828046744574
1999-10-01	5.16799544419134
2000-01-01	4.61626411319137
2000-04-01	4.27302214074179
2000-07-01	4.25016812373907
2000-10-01	3.80390002746498
2001-01-01	3.69146005509642
2001-04-01	3.55427473583093
2001-07-01	4.21858774662513
2001-10-01	3.64479787939032
2002-01-01	3.94684909880279
2002-04-01	3.75261506276151
2002-07-01	4.37919250727756
2002-10-01	4.24680521492191
2003-01-01	4.09920328964276
2003-04-01	4.00612401122735
2003-07-01	5.08474576271186
2003-10-01	4.18070635217771
2004-01-01	3.91716566866268
2004-04-01	3.82936260446551
2004-07-01	4.47994234926736
2004-10-01	4.06893250359023
2005-01-01	3.61689470553242
2005-04-01	3.79375146817007
2005-07-01	4.38676037179778
2005-10-01	4.20752565564424
2006-01-01	4.01679337342562
2006-04-01	4.09652076318743
2006-07-01	4.81289206143197
2006-10-01	3.90291898983273
2007-01-01	4.78615071283096
2007-04-01	5.32031483511009
2007-07-01	5.09535452322738
2007-10-01	4.50557034407966
2008-01-01	4.50113267014676
2008-04-01	5.20721599219893
2008-07-01	6.71785028790787
2008-10-01	6.35356407490930
2009-01-01	7.99526206692330
2009-04-01	9.54280155642023
2009-07-01	10.70634843946270
2009-10-01	9.76454293628809
2010-01-01	10.01000000000000
2010-04-01	11.55546821263630
2010-07-01	12.04534253326760
2010-10-01	12.01832121875930
2011-01-01	11.84514831573660
2011-04-01	12.33214849921010
2011-07-01	13.43490304709140
2011-10-01	12.38047808764940
2012-01-01	12.93413173652690
2012-04-01	12.83931048147410
2012-07-01	13.31817282974100
2012-10-01	11.90690240735190
2013-01-01	12.72165770073720
2013-04-01	13.25031617861660
2013-07-01	12.33980582524270
2013-10-01	11.38395049602200
2014-01-01	11.50766188828470
2014-04-01	11.26165930289640
2014-07-01	11.36823835695690
2014-10-01	9.35912465806956
2015-01-01	9.35407640803466
2015-04-01	9.55740239659838
2015-07-01	9.05863160925055
2015-10-01	7.65752765752766
2016-01-01	7.47104247104247
2016-04-01	8.24742268041237
2016-07-01	7.85374498647514
2016-10-01	6.75371031373286
2017-01-01	6.76741130091984
2017-04-01	6.15485196600355
2017-07-01	6.65432670060157
2017-10-01	5.60213765779047
2018-01-01	5.51672723884074
2018-04-01	5.80826386371874