Quarter	Percent
1978-01-01	18.0790144458489
1978-04-01	16.6831491447004
1978-07-01	17.2109851988715
1978-10-01	17.6109266323188
1979-01-01	18.4321421706249
1979-04-01	16.7701335274712
1979-07-01	17.0414326577168
1979-10-01	17.6417992399601
1980-01-01	18.5658989590522
1980-04-01	17.2300790931038
1980-07-01	17.3520918487591
1980-10-01	17.6618961730877
1981-01-01	18.0927527787133
1981-04-01	17.0444312031504
1981-07-01	17.5052059643935
1981-10-01	18.2139510436287
1982-01-01	18.6353920936301
1982-04-01	17.1971515334779
1982-07-01	17.8070711238002
1982-10-01	17.9538495977859
1983-01-01	18.3846576090105
1983-04-01	17.0530729747123
1983-07-01	17.5838497904609
1983-10-01	18.1530726457333
1984-01-01	18.8363457615867
1984-04-01	17.6565754724402
1984-07-01	18.0074469663293
1984-10-01	18.5012680020837
1985-01-01	19.3808330504564
1985-04-01	18.2627492678607
1985-07-01	18.6125616049905
1985-10-01	19.0995823062470
1986-01-01	19.8938580098465
1986-04-01	18.5593053820453
1986-07-01	18.6815486506217
1986-10-01	19.4013004789951
1987-01-01	20.2102496844115
1987-04-01	18.9191991315053
1987-07-01	18.9726289838698
1987-10-01	19.6892748020834
1988-01-01	20.5111393136358
1988-04-01	19.0734130275866
1988-07-01	19.2912646004469
1988-10-01	19.9116270374845
1989-01-01	20.6787040448726
1989-04-01	19.1437096588252
1989-07-01	19.4186255841972
1989-10-01	19.7368548268358
1990-01-01	20.5055805293216
1990-04-01	19.0305673428954
1990-07-01	19.2047487697151
1990-10-01	19.2521482830186
1991-01-01	19.8731909940247
1991-04-01	18.6572670603119
1991-07-01	18.7121747157261
1991-10-01	18.9844835122578
1992-01-01	19.3713801823081
1992-04-01	18.6123937251793
1992-07-01	18.6289054108978
1992-10-01	18.6458459632667
1993-01-01	19.5155450178515
1993-04-01	18.4403168882880
1993-07-01	18.5227928667455
1993-10-01	18.6165729503576
1994-01-01	19.6971467573424
1994-04-01	18.6115476666858
1994-07-01	18.5904669410728
1994-10-01	19.1984307420266
1995-01-01	20.0180553268780
1995-04-01	18.9387329129397
1995-07-01	18.4907805323156
1995-10-01	19.1047628901829
1996-01-01	19.9012365933429
1996-04-01	18.6239344219079
1996-07-01	18.3470208044531
1996-10-01	18.8489772778998
1997-01-01	19.2884333107067
1997-04-01	18.2302127955500
1997-07-01	18.5844580227108
1997-10-01	19.1105736533996
1998-01-01	19.7225118282261
1998-04-01	18.6650553838282
1998-07-01	18.9950800741975
1998-10-01	19.2985905169474
1999-01-01	19.8176189258968
1999-04-01	19.0055667578764
1999-07-01	19.1524033109431
1999-10-01	19.4333701552596
2000-01-01	20.2482661129888
2000-04-01	19.4615876811133
2000-07-01	19.5655462676996
2000-10-01	19.4944339015358
2001-01-01	20.5223487468213
2001-04-01	19.7961811096857
2001-07-01	20.0107590833698
2001-10-01	20.4637504171024
2002-01-01	21.1896722713260
2002-04-01	20.5892171492751
2002-07-01	20.4713279401470
2002-10-01	21.0301564611937
2003-01-01	21.6728259430782
2003-04-01	20.6995598499165
2003-07-01	21.0537012482178
2003-10-01	21.3077764631919
2004-01-01	22.1477244656540
2004-04-01	21.2624919239733
2004-07-01	21.3654766947367
2004-10-01	21.6346526380488
2005-01-01	22.1919647483470
2005-04-01	21.3829480274837
2005-07-01	21.2375274809380
2005-10-01	21.3951379149977
2006-01-01	21.9608237379559
2006-04-01	21.0397788589378
2006-07-01	21.0972049416026
2006-10-01	21.3818637265341
2007-01-01	21.6378479663669
2007-04-01	20.6105817736117
2007-07-01	20.9366003069677
2007-10-01	21.2226448357992
2008-01-01	21.6065160848398
2008-04-01	20.7342335336854
2008-07-01	21.0768606260255
2008-10-01	21.2929534838243
2009-01-01	21.8887898568895
2009-04-01	21.2594179255230
2009-07-01	21.6432759406657
2009-10-01	22.0309892827886
2010-01-01	22.1080842700272
2010-04-01	21.4489049050946
2010-07-01	21.6563499833897
2010-10-01	22.0011797741678
2011-01-01	22.1832655113650
2011-04-01	21.6074242896671
2011-07-01	22.1889362810288
2011-10-01	22.2214585093302
2012-01-01	22.5415719568723
2012-04-01	22.0447467530477
2012-07-01	22.2361721420102
2012-10-01	22.3946593027389
2013-01-01	22.6242013421305
2013-04-01	21.8829003266148
2013-07-01	22.0245074742597
2013-10-01	22.3234938874084
2014-01-01	22.5379114582048
2014-04-01	21.7843527982281
2014-07-01	21.8967370104316
2014-10-01	22.3573602047467
2015-01-01	22.2347456621276
2015-04-01	21.9605049916438
2015-07-01	21.7974546502016
2015-10-01	21.8763620767051
2016-01-01	22.1460692951969
2016-04-01	21.3480756963640
2016-07-01	21.3422816544722
2016-10-01	21.1804905885058
2017-01-01	21.8252667014301
2017-04-01	21.1032574073743
2017-07-01	20.9540748752314
2017-10-01	21.1349355324616
2018-01-01	21.0390310304042
2018-04-01	20.0544162125102
2018-07-01	20.1603905538722