Quarter	Percent
1978-01-01	45.5792255831238
1978-04-01	49.6604667492397
1978-07-01	49.2821886219869
1978-10-01	48.5171506540602
1979-01-01	46.4657391890047
1979-04-01	49.7067050391450
1979-07-01	49.7116579540116
1979-10-01	48.6091184558928
1980-01-01	46.3354009942548
1980-04-01	49.9114080734550
1980-07-01	50.0762583949340
1980-10-01	48.4850316333369
1981-01-01	46.2161217590860
1981-04-01	49.7958772159008
1981-07-01	49.6643810414641
1981-10-01	49.2598071191488
1982-01-01	47.2069313163068
1982-04-01	50.0969847729062
1982-07-01	49.6824777035205
1982-10-01	49.4781579615868
1983-01-01	48.1372029780966
1983-04-01	51.1330934068184
1983-07-01	50.9450460388301
1983-10-01	49.9818809308297
1984-01-01	47.5755990208452
1984-04-01	50.9822551790278
1984-07-01	51.0679816497219
1984-10-01	50.1907080058702
1985-01-01	48.3004585294446
1985-04-01	51.0129502320280
1985-07-01	50.8577313090419
1985-10-01	49.6921577666661
1986-01-01	48.3104177259461
1986-04-01	50.8511030146669
1986-07-01	50.7630217765959
1986-10-01	49.7669272415451
1987-01-01	48.0452939664815
1987-04-01	51.0925748508813
1987-07-01	50.8726029825626
1987-10-01	50.3446453054298
1988-01-01	48.7062099063206
1988-04-01	51.6580402075369
1988-07-01	51.3615694919162
1988-10-01	50.4995433401211
1989-01-01	49.3468967350395
1989-04-01	52.5564053364507
1989-07-01	52.2954499277282
1989-10-01	51.6304380571035
1990-01-01	50.5635799151724
1990-04-01	53.2524581549151
1990-07-01	53.0004972604243
1990-10-01	52.2914291909196
1991-01-01	51.2114328243224
1991-04-01	53.9103985663244
1991-07-01	53.6855523545064
1991-10-01	53.1256064969019
1992-01-01	51.6653707720696
1992-04-01	54.1489138781383
1992-07-01	53.6006943429931
1992-10-01	53.3476361890328
1993-01-01	51.0695983164830
1993-04-01	53.5975078358747
1993-07-01	53.2320969087334
1993-10-01	52.7927822378724
1994-01-01	51.0939787255466
1994-04-01	53.7314882241887
1994-07-01	52.8046788532403
1994-10-01	52.2538291536464
1995-01-01	51.0696641319521
1995-04-01	53.2126293902956
1995-07-01	52.8619438767944
1995-10-01	51.9422550553985
1996-01-01	50.8046533390616
1996-04-01	53.2934937393432
1996-07-01	53.3016252654989
1996-10-01	52.2694014499908
1997-01-01	51.5218964871804
1997-04-01	53.6454831538197
1997-07-01	53.6944428395641
1997-10-01	52.7839845417684
1998-01-01	51.7976088810440
1998-04-01	53.3621595078924
1998-07-01	52.9463701646598
1998-10-01	52.0300591960292
1999-01-01	50.7468774176337
1999-04-01	52.7332642943890
1999-07-01	52.4456859814028
1999-10-01	51.8110046066568
2000-01-01	50.5027295461785
2000-04-01	52.3906124297482
2000-07-01	52.2608438022302
2000-10-01	52.0518507133233
2001-01-01	51.1758568774502
2001-04-01	52.3243242665593
2001-07-01	51.8646013938109
2001-10-01	51.8119919728412
2002-01-01	50.3435970285354
2002-04-01	51.4642578517196
2002-07-01	51.5345679494221
2002-10-01	51.4537963831345
2003-01-01	50.1604223773482
2003-04-01	51.7560328239552
2003-07-01	51.7766381624533
2003-10-01	51.4501604896846
2004-01-01	50.7260012138168
2004-04-01	52.1047756784681
2004-07-01	52.4431893983190
2004-10-01	51.7729119390658
2005-01-01	51.0767040190661
2005-04-01	52.9090080588479
2005-07-01	52.9573836101191
2005-10-01	52.2091321186397
2006-01-01	51.7118801816477
2006-04-01	53.1810754105545
2006-07-01	53.3450449135520
2006-10-01	53.2479907677030
2007-01-01	51.9890607126291
2007-04-01	53.9749631942721
2007-07-01	53.4785593250242
2007-10-01	53.6141677703345
2008-01-01	52.4824945655259
2008-04-01	54.1078668813237
2008-07-01	53.6057283040306
2008-10-01	53.5077499415688
2009-01-01	52.7868282159547
2009-04-01	53.6637192405237
2009-07-01	53.6758290384981
2009-10-01	53.3154396201066
2010-01-01	52.9841301422302
2010-04-01	53.7963591028977
2010-07-01	54.0653184832432
2010-10-01	53.9767223618328
2011-01-01	53.3963303936574
2011-04-01	54.0757886299207
2011-07-01	53.9810778655186
2011-10-01	54.2257104645529
2012-01-01	53.3279263960303
2012-04-01	54.4182322523045
2012-07-01	54.4868782724390
2012-10-01	54.5889253843327
2013-01-01	54.6798216350488
2013-04-01	55.5501365826172
2013-07-01	55.6973560655346
2013-10-01	56.3428404764815
2014-01-01	55.4989110897678
2014-04-01	56.4091331487003
2014-07-01	56.5859968282769
2014-10-01	57.0978004318461
2015-01-01	56.3531954480284
2015-04-01	57.1769325570769
2015-07-01	57.5038734681910
2015-10-01	57.6469863693628
2016-01-01	57.5877516312990
2016-04-01	58.2000151395542
2016-07-01	59.0403875211536
2016-10-01	58.9905754815718
2017-01-01	58.5968063400223
2017-04-01	59.7978741359038
2017-07-01	60.3504992482710
2017-10-01	60.4094759516077
2018-01-01	60.8406002486073
2018-04-01	61.9313934551976
2018-07-01	62.3108405902725