Quarter	Percent
1986-01-01	36.8511175198270
1986-04-01	37.0911057042444
1986-07-01	37.0857348703170
1986-10-01	36.3979170407614
1987-01-01	36.4962850237221
1987-04-01	36.3229902530627
1987-07-01	36.8369351669941
1987-10-01	35.7645382491762
1988-01-01	36.6900719936006
1988-04-01	36.9955555555556
1988-07-01	37.4833377765929
1988-10-01	37.1884700665188
1989-01-01	38.0581148121899
1989-04-01	38.8248847926267
1989-07-01	38.7831015853335
1989-10-01	37.6423841059603
1990-01-01	37.5198028516106
1990-04-01	36.8661569557958
1990-07-01	37.2829328188037
1990-10-01	36.4200227133747
1991-01-01	36.2053959965187
1991-04-01	36.4686468646865
1991-07-01	36.8379994799341
1991-10-01	36.6865439460721
1992-01-01	36.5399534522886
1992-04-01	36.7877431571699
1992-07-01	37.4699209350292
1992-10-01	35.9811482433590
1993-01-01	36.9180831980866
1993-04-01	37.0386156337908
1993-07-01	36.8407621640014
1993-10-01	35.9721986777420
1994-01-01	35.3542176813307
1994-04-01	36.1064331424722
1994-07-01	35.9308086321270
1994-10-01	34.3590601220838
1995-01-01	34.9929231537757
1995-04-01	34.7114985471150
1995-07-01	34.4393876706661
1995-10-01	33.4843119492712
1996-01-01	33.3251372838292
1996-04-01	32.7997386475008
1996-07-01	32.2643659449780
1996-10-01	33.2469215813351
1997-01-01	32.8574885071377
1997-04-01	33.1778331858763
1997-07-01	33.0980266324402
1997-10-01	33.1175059952038
1998-01-01	33.0756356101060
1998-04-01	33.5295989815404
1998-07-01	33.5160034945596
1998-10-01	32.8845239980992
1999-01-01	32.8618836915297
1999-04-01	33.2149340910885
1999-07-01	33.2203924040659
1999-10-01	32.4666142969364
2000-01-01	32.7769942015358
2000-04-01	33.6568566061365
2000-07-01	32.9217785418457
2000-10-01	31.9177121483675
2001-01-01	32.3335146476028
2001-04-01	32.1012579593104
2001-07-01	32.3140047998761
2001-10-01	30.6442922022939
2002-01-01	31.0664014687882
2002-04-01	31.3665778454511
2002-07-01	31.5207512874886
2002-10-01	30.8253705515010
2003-01-01	31.3508667065152
2003-04-01	31.7013372956909
2003-07-01	30.8698544083955
2003-10-01	30.1954732510288
2004-01-01	30.6769995613394
2004-04-01	32.0369965770883
2004-07-01	31.1130460020316
2004-10-01	29.3514372381915
2005-01-01	30.1086096525930
2005-04-01	30.4266762280387
2005-07-01	29.2179010580498
2005-10-01	28.7311307319852
2006-01-01	28.4772437260740
2006-04-01	28.9529461636287
2006-07-01	29.3317355138869
2006-10-01	29.3332396543245
2007-01-01	28.2121339498389
2007-04-01	28.5984185851235
2007-07-01	29.4208062600433
2007-10-01	28.0359506723333
2008-01-01	29.4023627519110
2008-04-01	28.6824394643724
2008-07-01	28.2280410085896
2008-10-01	27.2940851299060
2009-01-01	28.2897911353140
2009-04-01	28.6667583929554
2009-07-01	28.9007822149032
2009-10-01	28.0634573304158
2010-01-01	28.4360512680665
2010-04-01	29.0509259259259
2010-07-01	29.1745988577645
2010-10-01	28.4328358208955
2011-01-01	28.0644724366789
2011-04-01	28.5791646923441
2011-07-01	28.8198673704155
2011-10-01	27.9726897857095
2012-01-01	27.7807811866468
2012-04-01	28.0451534405840
2012-07-01	28.0867743461512
2012-10-01	28.8530344967258
2013-01-01	27.6833872707659
2013-04-01	28.1595257343034
2013-07-01	27.6328177538668
2013-10-01	26.4114255062358
2014-01-01	26.1564171122995
2014-04-01	27.4848343443770
2014-07-01	26.6312292358804
2014-10-01	24.8908585791771
2015-01-01	25.4300968953925
2015-04-01	26.3095706971248
2015-07-01	27.1680837148463
2015-10-01	26.3839198594939
2016-01-01	25.6547888508051
2016-04-01	25.4517394379783
2016-07-01	25.5267371117515
2016-10-01	23.6770043940648
2017-01-01	23.6322188449848
2017-04-01	25.1970489942619
2017-07-01	23.7374371859296
2017-10-01	22.7980246296181
2018-01-01	22.9348096541428
2018-04-01	23.5246714604513
2018-07-01	23.3883429136535