Quarter	Percent
1981-01-01	14.14122137404580
1981-04-01	14.60564885496180
1981-07-01	14.51633587786260
1981-10-01	13.18854961832060
1982-01-01	15.17725190839690
1982-04-01	11.12244274809160
1982-07-01	10.21740458015270
1982-10-01	8.25251908396946
1983-01-01	11.58687022900760
1983-04-01	12.56335877862600
1983-07-01	12.46809160305340
1983-10-01	11.24748091603050
1984-01-01	13.74229007633590
1984-04-01	14.02809160305340
1984-07-01	12.73007633587790
1984-10-01	10.34839694656490
1985-01-01	11.25938931297710
1985-04-01	10.48534351145040
1985-07-01	9.05038167938931
1985-10-01	6.75801526717557
1986-01-01	7.72259541984733
1986-04-01	7.17480916030534
1986-07-01	6.15068702290076
1986-10-01	4.63236641221374
1987-01-01	5.86488549618321
1987-04-01	7.02000000000000
1987-07-01	7.57374045801527
1987-10-01	6.22213740458015
1988-01-01	7.40106870229008
1988-04-01	7.15694656488550
1988-07-01	7.04977099236641
1988-10-01	5.88870229007634
1989-01-01	7.16885496183206
1989-04-01	6.35908396946565
1989-07-01	5.72198473282443
1989-10-01	4.70977099236641
1990-01-01	6.41267175572519
1990-04-01	8.90152671755725
1990-07-01	7.90717557251908
1990-10-01	7.37725190839695
1991-01-01	9.84943511450382
1991-04-01	9.72916030534351
1991-07-01	7.27186259541985
1991-10-01	7.66424427480916
1992-01-01	10.38293129770990
1992-04-01	10.45616793893130
1992-07-01	10.02151145038170
1992-10-01	9.59221374045802
1993-01-01	10.51570992366410
1993-04-01	9.80537404580153
1993-07-01	9.30343511450382
1993-10-01	8.35731297709924
1994-01-01	10.01734351145040
1994-04-01	9.51778625954198
1994-07-01	9.53148091603053
1994-10-01	7.11883969465649
1995-01-01	7.79821374045802
1995-04-01	8.00422900763359
1995-07-01	8.89200000000000
1995-10-01	8.49664122137404
1996-01-01	10.33648854961830
1996-04-01	10.64432061068700
1996-07-01	9.75476335877862
1996-10-01	8.05841221374046
1997-01-01	9.92683969465649
1997-04-01	10.62348091603050
1997-07-01	10.45438167938930
1997-10-01	9.47729770992366
1998-01-01	13.61487022900760
1998-04-01	14.32401526717560
1998-07-01	13.97986259541980
1998-10-01	12.40080916030530
1999-01-01	13.93282442748090
1999-04-01	14.02809160305340
1999-07-01	13.45053435114500
1999-10-01	12.58122137404580
2000-01-01	14.19480916030530
2000-04-01	13.71847328244270
2000-07-01	12.49786259541980
2000-10-01	10.58061068702290
2001-01-01	10.64610687022900
2001-04-01	11.75954198473280
2001-07-01	11.02717557251910
2001-10-01	11.26666666666670
2002-01-01	12.20032447856970
2002-04-01	12.05657010960140
2002-07-01	11.75197603894700
2002-10-01	10.90654459360810
2003-01-01	11.69546443394210
2003-04-01	12.85155068354590
2003-07-01	13.02219768780790
2003-10-01	12.08291972893260
2004-01-01	12.25644854909490
2004-04-01	12.42015116840770
2004-07-01	11.22443172606620
2004-10-01	10.30084534107170
2005-01-01	10.60297444424390
2005-04-01	10.16114914069000
2005-07-01	9.55534105974858
2005-10-01	9.23947035138167
2006-01-01	9.96589455322358
2006-04-01	10.37984769566380
2006-07-01	10.48829853963590
2006-10-01	9.28449380992638
2007-01-01	9.80721250242614
2007-04-01	10.04035756620680
2007-07-01	9.38285293896963
2007-10-01	8.16467251680429
2008-01-01	8.45919771064614
2008-04-01	8.13199026462586
2008-07-01	7.82220508051136
2008-10-01	7.30103315829648
2009-01-01	8.59574983539730
2009-04-01	8.64310833208286
2009-07-01	7.95124284990874
2009-10-01	7.24528101215054
2010-01-01	7.41511520695735
2010-04-01	7.25965286768368
2010-07-01	6.65344517707962
2010-10-01	5.70042110404709
2011-01-01	6.30433510758588
2011-04-01	6.34100855794072
2011-07-01	6.02589396252375
2011-10-01	5.24223127337995
2012-01-01	5.83342535809628
2012-04-01	5.91102091744180
2012-07-01	5.38017929198041
2012-10-01	4.95644579881972
2013-01-01	5.56241492861523
2013-04-01	5.86552700440483
2013-07-01	5.44995216739893
2013-10-01	4.72408385607160
2014-01-01	4.99112700463295
2014-04-01	4.85907223873866
2014-07-01	4.93354376775610
2014-10-01	4.62231427977079
2015-01-01	5.78436263552780
2015-04-01	6.66841145504780
2015-07-01	7.53999263897249