Quarter	Percent
1978-04-01	36.5499123367378
1978-07-01	37.5139980403817
1978-10-01	36.6832970058005
1979-01-01	35.1332828990257
1979-04-01	36.7217601249746
1979-07-01	37.2152186204464
1979-10-01	35.5395481399909
1980-01-01	33.5742540142066
1980-04-01	34.1275206579019
1980-07-01	34.1748580103548
1980-10-01	33.4222673093054
1981-01-01	33.2144053328045
1981-04-01	34.7936428701996
1981-07-01	35.1280299765933
1981-10-01	34.7947587930136
1982-01-01	32.8754142900156
1982-04-01	34.7871074623004
1982-07-01	36.2205770322585
1982-10-01	34.6103974540786
1983-01-01	33.6343659724224
1983-04-01	34.5180886905511
1983-07-01	34.9953788415526
1983-10-01	33.3651079296127
1984-01-01	32.2284458721407
1984-04-01	33.5067831439510
1984-07-01	35.1545215767995
1984-10-01	34.4378550400883
1985-01-01	32.3762014511326
1985-04-01	33.7133188795464
1985-07-01	34.0078239130780
1985-10-01	32.8848659970634
1986-01-01	31.0148202035674
1986-04-01	31.9790898136550
1986-07-01	33.2465922283667
1986-10-01	31.8287865596969
1987-01-01	30.4920968909460
1987-04-01	32.8507815644550
1987-07-01	33.9387434678815
1987-10-01	32.0151408794727
1988-01-01	30.8425606203830
1988-04-01	32.9659677935383
1988-07-01	34.1755196917070
1988-10-01	32.7232003590981
1989-01-01	29.9299211879378
1989-04-01	31.7030725562618
1989-07-01	32.1190244791195
1989-10-01	31.4015351408410
1990-01-01	29.8437505585120
1990-04-01	31.6818483258289
1990-07-01	31.6525622437276
1990-10-01	31.3999721738796
1991-01-01	31.2974601066742
1991-04-01	33.6287358465865
1991-07-01	34.5913328795008
1991-10-01	33.7322063933372
1992-01-01	32.4637332332385
1992-04-01	34.3264908096739
1992-07-01	34.0998789084929
1992-10-01	33.1708945668851
1993-01-01	32.2410155740375
1993-04-01	35.6191156715857
1993-07-01	35.6954058514950
1993-10-01	33.5602549391194
1994-01-01	30.5708462374897
1994-04-01	32.8948190192349
1994-07-01	32.5684097352996
1994-10-01	31.3988173877684
1995-01-01	29.1371117476110
1995-04-01	30.8743845816239
1995-07-01	31.6919552852132
1995-10-01	30.0755803428036
1996-01-01	29.2215557363719
1996-04-01	30.7202275551940
1996-07-01	31.2984482966553
1996-10-01	30.8395933418689
1997-01-01	30.3745391793100
1997-04-01	33.0632014213794
1997-07-01	34.0928685616544
1997-10-01	32.4106214115772
1998-01-01	31.3394583656452
1998-04-01	33.2766906467091
1998-07-01	33.4108740847660
1998-10-01	31.5505924642780
1999-01-01	30.5008283644855
1999-04-01	32.6590921608946
1999-07-01	33.3708926128370
1999-10-01	31.6027461955713
2000-01-01	30.8503305988951
2000-04-01	32.0927326176732
2000-07-01	31.9790780199293
2000-10-01	31.2634358414607
2001-01-01	30.0108384043720
2001-04-01	30.9289443733084
2001-07-01	32.1898916785339
2001-10-01	30.6072607733958
2002-01-01	30.4452781603318
2002-04-01	33.0813475856814
2002-07-01	32.7912526824444
2002-10-01	30.7884865309972
2003-01-01	29.2077873006004
2003-04-01	31.9591721110816
2003-07-01	32.4760853272740
2003-10-01	30.3176913955858
2004-01-01	29.2665057872586
2004-04-01	31.3372945302089
2004-07-01	32.6301576599233
2004-10-01	30.4662284818128
2005-01-01	29.1711736401152
2005-04-01	30.8071882824104
2005-07-01	31.5058255877623
2005-10-01	30.2458373858858
2006-01-01	29.4569030420373
2006-04-01	31.0983031115797
2006-07-01	31.1419710714061
2006-10-01	30.3558976115524
2007-01-01	29.3101505789493
2007-04-01	30.7981040643700
2007-07-01	31.4253651695160
2007-10-01	29.7055952793493
2008-01-01	29.0285676924371
2008-04-01	30.2057453964820
2008-07-01	31.5831962000173
2008-10-01	31.2746882427910
2009-01-01	30.4940033176435
2009-04-01	32.9360534880012
2009-07-01	34.0618214665006
2009-10-01	31.5799487743062
2010-01-01	31.0743623757385
2010-04-01	33.3431077057984
2010-07-01	34.2144833725293
2010-10-01	32.6062453705961
2011-01-01	30.5407750152899
2011-04-01	32.9778429182188
2011-07-01	33.5842110539366
2011-10-01	33.0099657268750
2012-01-01	31.3591501406251
2012-04-01	32.8423410157773
2012-07-01	34.9988397538196
2012-10-01	33.6639000833852
2013-01-01	32.4383125601945
2013-04-01	34.2484953129592
2013-07-01	34.3487653204054
2013-10-01	33.9060024406497
2014-01-01	32.4642596736907
2014-04-01	34.1928245113478
2014-07-01	34.7919725976873
2014-10-01	33.5437666856176
2015-01-01	32.6350726836345
2015-04-01	33.6227546280089
2015-07-01	34.1995349442129
2015-10-01	32.6486490231365
2016-01-01	32.6503606366102
2016-04-01	33.0984020799183
2016-07-01	34.9035889532552
2016-10-01	33.9040494123002
2017-01-01	32.9053575440289
2017-04-01	34.7246125404329
2017-07-01	34.2293473879052
2017-10-01	32.7774184072835
2018-01-01	31.0147091032025
2018-04-01	32.3984295881763
2018-07-01	33.9861798162088