Quarter	Percent
1978-04-01	70.7113570830784
1978-07-01	69.4176599462556
1978-10-01	68.0090010953138
1979-01-01	67.1302583313508
1979-04-01	67.3311731900175
1979-07-01	67.8965059278747
1979-10-01	67.7822902537659
1980-01-01	67.2302113343810
1980-04-01	67.4516525640877
1980-07-01	67.0922794508870
1980-10-01	66.2042254116404
1981-01-01	65.3655702050887
1981-04-01	65.0476927900435
1981-07-01	65.6523874512372
1981-10-01	64.9475983343829
1982-01-01	64.4646734282858
1982-04-01	63.5293881295435
1982-07-01	63.3090363869084
1982-10-01	61.5777761802514
1983-01-01	59.7586779138597
1983-04-01	58.5721518699607
1983-07-01	58.4663602714062
1983-10-01	58.3207229025586
1984-01-01	58.2165553479394
1984-04-01	58.7577191249127
1984-07-01	58.1639682787588
1984-10-01	57.7704084955649
1985-01-01	56.8613245765302
1985-04-01	55.8639648853041
1985-07-01	56.7024601206356
1985-10-01	58.7693214976121
1986-01-01	58.1838763921856
1986-04-01	58.8122590840792
1986-07-01	57.7928657531302
1986-10-01	57.8539482963502
1987-01-01	57.2734113255445
1987-04-01	57.4761260129362
1987-07-01	56.7615697242134
1987-10-01	57.3094635210981
1988-01-01	57.6331838084616
1988-04-01	57.7209420631894
1988-07-01	57.1303636992569
1988-10-01	57.3096643853642
1989-01-01	57.5251759181085
1989-04-01	58.9553979440915
1989-07-01	59.3173213548502
1989-10-01	59.4441452811528
1990-01-01	57.6149622748597
1990-04-01	58.3819825596662
1990-07-01	59.5365526408130
1990-10-01	59.5397761614658
1991-01-01	57.2691181784364
1991-04-01	56.1522869447339
1991-07-01	54.6139531207543
1991-10-01	55.1486038747910
1992-01-01	54.8132205744881
1992-04-01	54.7414539036331
1992-07-01	54.4301341212210
1992-10-01	53.1836249972409
1993-01-01	51.7214936627164
1993-04-01	52.0088718805977
1993-07-01	51.6503823160789
1993-10-01	52.8719011112515
1994-01-01	53.3014099954391
1994-04-01	54.7205437876120
1994-07-01	54.4827104093260
1994-10-01	54.8275300541247
1995-01-01	55.2708566746239
1995-04-01	55.7510677714262
1995-07-01	55.9981400766023
1995-10-01	55.9036968679653
1996-01-01	54.5964909224562
1996-04-01	55.3178814396420
1996-07-01	54.8879539567527
1996-10-01	55.3070417932806
1997-01-01	55.2877125621191
1997-04-01	55.4095755829278
1997-07-01	55.0763154657148
1997-10-01	55.9451630648210
1998-01-01	55.0657007713624
1998-04-01	56.5612429695194
1998-07-01	56.7208038868204
1998-10-01	56.3193446031719
1999-01-01	55.4882453830108
1999-04-01	56.2270384895293
1999-07-01	57.2137455688333
1999-10-01	57.2428068559698
2000-01-01	56.2689871613320
2000-04-01	57.5689487268953
2000-07-01	58.3720817491151
2000-10-01	58.2145233114722
2001-01-01	56.7637430418726
2001-04-01	57.2193890338089
2001-07-01	57.0523336213521
2001-10-01	57.6962135483761
2002-01-01	57.8734329928334
2002-04-01	59.1589113080298
2002-07-01	58.6495013361111
2002-10-01	59.5366907814661
2003-01-01	60.2635101908565
2003-04-01	60.7188090503058
2003-07-01	60.9470710953134
2003-10-01	61.2055905544567
2004-01-01	61.0383074860335
2004-04-01	62.4544454398853
2004-07-01	62.5365236650712
2004-10-01	62.4898296308582
2005-01-01	62.2811571253600
2005-04-01	64.0014358465691
2005-07-01	64.1874778197188
2005-10-01	64.5264817970754
2006-01-01	64.1196662501966
2006-04-01	64.7708298864592
2006-07-01	65.5855879137809
2006-10-01	65.1256388583684
2007-01-01	64.9041757253343
2007-04-01	66.3010687009282
2007-07-01	66.3596400295843
2007-10-01	65.4162108334160
2008-01-01	64.1191508471053
2008-04-01	66.0046111909433
2008-07-01	66.2535777805728
2008-10-01	65.9203293949463
2009-01-01	66.2780140265006
2009-04-01	66.8008255330821
2009-07-01	66.8508325693017
2009-10-01	66.9775331337756
2010-01-01	67.0806712989907
2010-04-01	68.3783876742939
2010-07-01	69.1069545052303
2010-10-01	69.6917657632621
2011-01-01	69.3561159177121
2011-04-01	69.4050926560666
2011-07-01	68.7688140629910
2011-10-01	68.6070356997875
2012-01-01	68.0114452009066
2012-04-01	69.4197966071901
2012-07-01	69.1295716465604
2012-10-01	69.7485433679553
2013-01-01	68.7270741729900
2013-04-01	69.5132050629049
2013-07-01	68.9414458885932
2013-10-01	68.7286411081290
2014-01-01	68.4446530236224
2014-04-01	69.1867400116584
2014-07-01	69.7058214735578
2014-10-01	68.8610889804546
2015-01-01	68.6018073035817
2015-04-01	69.8399010194883
2015-07-01	69.0073398491429
2015-10-01	69.6078145844763
2016-01-01	69.1067389204474
2016-04-01	68.9731878109355
2016-07-01	67.4977627054749
2016-10-01	68.3319518747038
2017-01-01	68.1520136570785
2017-04-01	69.5554088872763
2017-07-01	69.8906479365080
2017-10-01	70.7081208447494
2018-01-01	70.0300203236957
2018-04-01	69.3044214466897
2018-07-01	69.7062351978038