Quarter	Percent
1978-04-01	77.4450076553358
1978-07-01	77.6813952281709
1978-10-01	78.1248707609875
1979-01-01	78.5956449065520
1979-04-01	78.8686058857457
1979-07-01	79.3448938019367
1979-10-01	79.3387925208373
1980-01-01	79.1341277462731
1980-04-01	78.1475220048189
1980-07-01	77.3883201628454
1980-10-01	78.0301952576746
1981-01-01	79.1414974777174
1981-04-01	79.2627659670421
1981-07-01	78.3084607831913
1981-10-01	78.4626415795685
1982-01-01	79.6178056131673
1982-04-01	80.1706227486711
1982-07-01	81.1042272334938
1982-10-01	79.2203680733757
1983-01-01	78.9605128799268
1983-04-01	79.6861790524900
1983-07-01	79.2562867576333
1983-10-01	79.4807092311805
1984-01-01	79.2914624099108
1984-04-01	79.3141705530108
1984-07-01	79.5543957866175
1984-10-01	79.1825355652862
1985-01-01	79.7669404099941
1985-04-01	80.1561250530392
1985-07-01	79.8463044921163
1985-10-01	79.5362519502990
1986-01-01	79.0573659190727
1986-04-01	78.3187978394092
1986-07-01	78.8414343321327
1986-10-01	78.1987617837554
1987-01-01	77.7436944061695
1987-04-01	77.3999653808035
1987-07-01	77.7551882519570
1987-10-01	78.2028082440386
1988-01-01	78.1812966893534
1988-04-01	77.3127845892211
1988-07-01	77.0982895344595
1988-10-01	76.2991396034317
1989-01-01	76.4828541187664
1989-04-01	76.0239371656121
1989-07-01	76.6228728146543
1989-10-01	76.4037948022820
1990-01-01	76.9798371247328
1990-04-01	75.5814268422257
1990-07-01	74.2761891133097
1990-10-01	73.7852863356625
1991-01-01	74.9156022079555
1991-04-01	74.4095539624610
1991-07-01	74.9496124861396
1991-10-01	74.2407139569978
1992-01-01	75.0927621601496
1992-04-01	74.5925429355395
1992-07-01	74.4178839295197
1992-10-01	74.8489932529512
1993-01-01	74.6149544542493
1993-04-01	74.3667273425660
1993-07-01	73.3209957105051
1993-10-01	72.8600992456134
1994-01-01	73.1355912508947
1994-04-01	72.1087199162235
1994-07-01	72.0497862230581
1994-10-01	72.0169966991349
1995-01-01	72.9308366317129
1995-04-01	71.4288600564786
1995-07-01	71.4368292784117
1995-10-01	70.1785353257671
1996-01-01	69.3936757369216
1996-04-01	69.1882240932035
1996-07-01	68.8702984155382
1996-10-01	69.1904142577135
1997-01-01	69.1178096597734
1997-04-01	68.6145642122452
1997-07-01	68.6118211591258
1997-10-01	68.8924363541453
1998-01-01	68.9561633859474
1998-04-01	67.3386446362659
1998-07-01	66.9119832138153
1998-10-01	67.6685461149940
1999-01-01	68.8784900341926
1999-04-01	68.1617644886138
1999-07-01	67.1580036094521
1999-10-01	66.2639172817916
2000-01-01	65.8130432719328
2000-04-01	64.2494463370100
2000-07-01	64.0184390481236
2000-10-01	64.5856860879679
2001-01-01	64.7429411797634
2001-04-01	62.4703747047496
2001-07-01	62.5618567423411
2001-10-01	61.8334849901925
2002-01-01	61.2617977873734
2002-04-01	61.1355113919379
2002-07-01	61.1296952059100
2002-10-01	60.2519048756526
2003-01-01	60.0951927609567
2003-04-01	58.7262340384611
2003-07-01	58.9145919017421
2003-10-01	58.9964413702241
2004-01-01	59.4677827491791
2004-04-01	57.8030097210788
2004-07-01	56.5423500811059
2004-10-01	56.5435311056531
2005-01-01	56.6635225660387
2005-04-01	56.0209108180254
2005-07-01	55.0295113797381
2005-10-01	54.7144028540425
2006-01-01	54.2478346502097
2006-04-01	52.9392627872949
2006-07-01	52.0587967703680
2006-10-01	51.8862608978720
2007-01-01	52.2939616553806
2007-04-01	51.2849141728765
2007-07-01	51.1939671385151
2007-10-01	51.0149593805806
2008-01-01	51.2367327321448
2008-04-01	50.0946655778183
2008-07-01	49.1142547002414
2008-10-01	49.2027892735036
2009-01-01	47.9763543683151
2009-04-01	47.0001007737178
2009-07-01	47.4704017571113
2009-10-01	46.0630483596036
2010-01-01	46.5239978759264
2010-04-01	46.3230546726749
2010-07-01	45.5907790416082
2010-10-01	44.9891493712549
2011-01-01	46.2057653831677
2011-04-01	45.1811256260995
2011-07-01	44.1604797659300
2011-10-01	44.5596569294958
2012-01-01	44.9320135705270
2012-04-01	44.1893169515962
2012-07-01	43.8724848102858
2012-10-01	44.3656385232680
2013-01-01	44.5785235271386
2013-04-01	43.4869532821985
2013-07-01	44.2891917716070
2013-10-01	44.4917635850113
2014-01-01	44.8248684741256
2014-04-01	43.5830947885174
2014-07-01	43.2016535368025
2014-10-01	43.7130040886064
2015-01-01	43.9817981128029
2015-04-01	43.1790349785313
2015-07-01	42.7374513236415
2015-10-01	41.0417851851083
2016-01-01	41.2828003134978
2016-04-01	41.0100525101968
2016-07-01	41.4407714148522
2016-10-01	40.9693393692962
2017-01-01	40.6646020632484
2017-04-01	39.3797033638908
2017-07-01	39.7291676226729
2017-10-01	39.8547788459098
2018-01-01	40.5686422404620
2018-04-01	39.5644740496525
2018-07-01	39.0413745711755