Quarter	Percent
1978-04-01	21.9065857949760
1978-07-01	21.7126214783731
1978-10-01	21.4272204003515
1979-01-01	20.8723695639752
1979-04-01	20.6016102218261
1979-07-01	20.1683184712685
1979-10-01	20.1132022131323
1980-01-01	20.3339641339268
1980-04-01	21.3367951482183
1980-07-01	21.9612520987606
1980-10-01	21.3321048027821
1981-01-01	20.4728264663086
1981-04-01	20.2786604994970
1981-07-01	21.1672213646419
1981-10-01	21.0738014289892
1982-01-01	19.7934794805750
1982-04-01	19.3056774162713
1982-07-01	18.3142168363934
1982-10-01	20.2019195760903
1983-01-01	20.2845155248432
1983-04-01	19.6716390336042
1983-07-01	19.9990909749059
1983-10-01	19.9746365357091
1984-01-01	19.9850921246238
1984-04-01	19.9450821841968
1984-07-01	19.8019556877952
1984-10-01	20.1972307723571
1985-01-01	19.5374236054437
1985-04-01	19.0566925545091
1985-07-01	19.5175308587425
1985-10-01	19.7584039045649
1986-01-01	20.2465981336065
1986-04-01	20.7930856380016
1986-07-01	20.4070290515940
1986-10-01	21.0962887885579
1987-01-01	21.5595715229232
1987-04-01	21.8696444364542
1987-07-01	21.5748527804273
1987-10-01	21.0283198772807
1988-01-01	20.9973388959357
1988-04-01	21.8703784207247
1988-07-01	22.2459790664104
1988-10-01	22.9828417195810
1989-01-01	22.6023518190625
1989-04-01	23.2644830753580
1989-07-01	22.7891820477253
1989-10-01	22.8371442847162
1990-01-01	22.4315114298817
1990-04-01	23.7446634571984
1990-07-01	24.9469607692130
1990-10-01	25.3690290625187
1991-01-01	24.2221801611376
1991-04-01	24.6142688869632
1991-07-01	23.9530878774544
1991-10-01	24.7839075400655
1992-01-01	23.9521266844826
1992-04-01	24.3465525859995
1992-07-01	24.6308417026660
1992-10-01	24.2120256355967
1993-01-01	24.2898663154156
1993-04-01	24.5291801904848
1993-07-01	25.3920272727509
1993-10-01	25.6195148819635
1994-01-01	25.0785102882198
1994-04-01	26.3423029460712
1994-07-01	26.5158624551033
1994-10-01	26.5712803516865
1995-01-01	25.9540801950950
1995-04-01	27.5995648862772
1995-07-01	27.3017934172657
1995-10-01	28.4899141616413
1996-01-01	28.9834606462177
1996-04-01	29.1889705379344
1996-07-01	29.7833406396894
1996-10-01	29.5775432818184
1997-01-01	29.3239022256094
1997-04-01	30.0621237673067
1997-07-01	30.0754792950425
1997-10-01	29.7792060594300
1998-01-01	29.4690817726366
1998-04-01	31.1786680728135
1998-07-01	31.5776566967664
1998-10-01	31.1316328459981
1999-01-01	29.8959417319965
1999-04-01	30.8762820867408
1999-07-01	31.6129778700060
1999-10-01	32.6158518505307
2000-01-01	32.7794383038369
2000-04-01	34.5499039084643
2000-07-01	35.1924666243501
2000-10-01	34.3500111523920
2001-01-01	34.2057730705103
2001-04-01	36.4359953921324
2001-07-01	36.2810207709235
2001-10-01	37.0679096259874
2002-01-01	37.4857143489753
2002-04-01	37.7437208432367
2002-07-01	37.8926659395306
2002-10-01	38.4891628619421
2003-01-01	38.6822995220272
2003-04-01	40.0448422354467
2003-07-01	39.8518041022232
2003-10-01	39.7604748462721
2004-01-01	39.3480682400847
2004-04-01	40.8403518461904
2004-07-01	42.0233528116161
2004-10-01	42.2772431185266
2005-01-01	41.7142176905693
2005-04-01	42.7127142258690
2005-07-01	43.8577417106641
2005-10-01	44.1582199455553
2006-01-01	44.3148138977393
2006-04-01	45.8775378103993
2006-07-01	46.5549601242178
2006-10-01	46.8858700315991
2007-01-01	46.1557343696919
2007-04-01	47.4260861788391
2007-07-01	47.6435088221562
2007-10-01	47.8867421336693
2008-01-01	47.6770700203408
2008-04-01	48.9347893010872
2008-07-01	49.9580061675875
2008-10-01	49.7602151715732
2009-01-01	50.4169920884249
2009-04-01	51.5036021849051
2009-07-01	51.1843884056897
2009-10-01	52.3093475733468
2010-01-01	51.8890154315721
2010-04-01	52.4454143026461
2010-07-01	52.8895355388424
2010-10-01	53.6556122658279
2011-01-01	52.2835487303517
2011-04-01	53.2535375899598
2011-07-01	54.2247896613522
2011-10-01	53.7812320893660
2012-01-01	53.3357343499966
2012-04-01	54.0875104187387
2012-07-01	54.2800321808972
2012-10-01	54.0080779152393
2013-01-01	53.6187825062180
2013-04-01	54.8198194473394
2013-07-01	53.7960802030960
2013-10-01	53.8209584181572
2014-01-01	52.4896293272593
2014-04-01	54.2566062846903
2014-07-01	54.9475970435931
2014-10-01	54.4374730338949
2015-01-01	54.0287051158511
2015-04-01	54.9006090872248
2015-07-01	55.1135763531054
2015-10-01	56.8905222731344
2016-01-01	56.4122243160520
2016-04-01	56.8761214693765
2016-07-01	56.4215079472645
2016-10-01	57.1181008895438
2017-01-01	56.9706482759005
2017-04-01	58.5591255505270
2017-07-01	57.9898261814435
2017-10-01	57.9059899335839
2018-01-01	56.9377858415362
2018-04-01	58.0568372608026
2018-07-01	58.6418717897653