Quarter	Percent
1978-04-01	70.5769851720232
1978-07-01	70.5737663788989
1978-10-01	70.9450302177374
1979-01-01	69.9397925925862
1979-04-01	70.7098940715267
1979-07-01	70.8281050653390
1979-10-01	71.4015190508469
1980-01-01	70.5377651247940
1980-04-01	71.0668962542033
1980-07-01	71.5747113627582
1980-10-01	71.5826012956038
1981-01-01	70.7032587677143
1981-04-01	71.5453130980888
1981-07-01	71.6928315588174
1981-10-01	71.6242733642183
1982-01-01	70.6221235520055
1982-04-01	70.9426995380608
1982-07-01	70.8061469883633
1982-10-01	70.1881956052786
1983-01-01	68.5140303181418
1983-04-01	68.6447511332621
1983-07-01	68.9765858817032
1983-10-01	69.3996901017884
1984-01-01	68.8133094307943
1984-04-01	70.0605514760891
1984-07-01	70.3689323404394
1984-10-01	70.8623655201037
1985-01-01	70.0559962961578
1985-04-01	70.5725089066061
1985-07-01	71.4020599824276
1985-10-01	72.2141766328147
1986-01-01	71.6266458070960
1986-04-01	72.8483981802880
1986-07-01	72.9973816845965
1986-10-01	73.2142449301374
1987-01-01	72.0701359473411
1987-04-01	73.0023086495722
1987-07-01	73.3175081444628
1987-10-01	73.3957786296752
1988-01-01	73.2163395773386
1988-04-01	74.3002794841998
1988-07-01	74.3752125289551
1988-10-01	74.9340259668386
1989-01-01	73.9969602846412
1989-04-01	75.5673354691770
1989-07-01	75.9710586412695
1989-10-01	76.6290489373371
1990-01-01	75.7063004090959
1990-04-01	76.6813904541884
1990-07-01	76.1282440361993
1990-10-01	75.6206466792648
1991-01-01	74.1866241721470
1991-04-01	74.7866473984282
1991-07-01	74.2630571775158
1991-10-01	73.8313337402423
1992-01-01	72.9954228229514
1992-04-01	73.4694139958386
1992-07-01	73.4691232527516
1992-10-01	73.2221376742458
1993-01-01	72.1162403955895
1993-04-01	72.7316605043340
1993-07-01	73.0364552391985
1993-10-01	73.5055067393459
1994-01-01	72.4377108271319
1994-04-01	73.5020350019144
1994-07-01	74.2211224354359
1994-10-01	74.2567369411702
1995-01-01	73.7505284752253
1995-04-01	75.1394520750581
1995-07-01	75.5130309346164
1995-10-01	75.7732431266676
1996-01-01	74.7494447267502
1996-04-01	74.9552754744076
1996-07-01	75.1188229857997
1996-10-01	75.1319005306444
1997-01-01	74.3041935827997
1997-04-01	74.8459849212721
1997-07-01	75.1478716080177
1997-10-01	75.3200138631835
1998-01-01	74.3699994141788
1998-04-01	75.1719095953906
1998-07-01	75.4314911973218
1998-10-01	75.5830974892242
1999-01-01	74.7399863066341
1999-04-01	75.4673552454939
1999-07-01	75.7141137923144
1999-10-01	76.0440233391832
2000-01-01	75.0645122146292
2000-04-01	76.2977560027030
2000-07-01	77.0062030928119
2000-10-01	76.5446824519814
2001-01-01	75.6165204922644
2001-04-01	76.5527618054521
2001-07-01	76.5366705172984
2001-10-01	76.4149423520697
2002-01-01	75.8361117226867
2002-04-01	76.5829958048461
2002-07-01	77.0720889788436
2002-10-01	77.4132254276921
2003-01-01	77.0322838207676
2003-04-01	77.3238668984238
2003-07-01	77.3208644056690
2003-10-01	77.4217861250874
2004-01-01	76.7202589363358
2004-04-01	77.3326420557903
2004-07-01	77.5535670070286
2004-10-01	78.1938280464026
2005-01-01	78.0033736110590
2005-04-01	78.8678371977575
2005-07-01	79.1137214023786
2005-10-01	79.0738472691591
2006-01-01	78.2560578676843
2006-04-01	79.1429423462630
2006-07-01	79.6300192193121
2006-10-01	79.6841467054211
2007-01-01	79.0973508970754
2007-04-01	79.8091249906724
2007-07-01	80.2948725407899
2007-10-01	80.5052957633396
2008-01-01	79.9913365845327
2008-04-01	80.3852812126242
2008-07-01	80.3664761591931
2008-10-01	80.5003581934674
2009-01-01	79.1444656863750
2009-04-01	79.2773986020311
2009-07-01	79.1371744233713
2009-10-01	79.0426381005724
2010-01-01	78.6612547313700
2010-04-01	79.2062104487421
2010-07-01	79.8325251337687
2010-10-01	80.1490917327364
2011-01-01	79.5859500057314
2011-04-01	79.9577609653701
2011-07-01	79.8073137923772
2011-10-01	79.8582276424066
2012-01-01	79.1338097336173
2012-04-01	79.5380375010873
2012-07-01	79.6106968569349
2012-10-01	79.5163347045054
2013-01-01	79.0065713314809
2013-04-01	79.2366598487676
2013-07-01	79.1723989295577
2013-10-01	79.1549434129080
2014-01-01	78.5367390328793
2014-04-01	79.0051064198174
2014-07-01	78.7189682885277
2014-10-01	78.9228113497174
2015-01-01	78.8405945833551
2015-04-01	79.4145214462074
2015-07-01	79.2649230565551
2015-10-01	79.6965626981269
2016-01-01	79.2289385887069
2016-04-01	79.7535837934709
2016-07-01	79.7085581995397
2016-10-01	80.0419369781930
2017-01-01	79.2691949453828
2017-04-01	80.2951405246338
2017-07-01	80.2680259022330
2017-10-01	81.0597583589657
2018-01-01	80.5642344370462
2018-04-01	81.0367616764471
2018-07-01	80.8257249973140