Quarter	Percent
1978-01-01	79.3812989359755
1978-04-01	81.1005787351735
1978-07-01	80.5839345580429
1978-10-01	80.1826638933600
1979-01-01	79.2447486931915
1979-04-01	81.1707402938002
1979-07-01	80.8262504101982
1979-10-01	80.2958500868325
1980-01-01	79.1871126353731
1980-04-01	80.8377803630644
1980-07-01	80.5868206819173
1980-10-01	80.1343291225323
1981-01-01	79.4880132522288
1981-04-01	80.6654955639347
1981-07-01	80.3360561853759
1981-10-01	79.5984677777824
1982-01-01	78.8501107351222
1982-04-01	80.4686498208730
1982-07-01	79.8989757931154
1982-10-01	79.6476557640284
1983-01-01	78.7810355367492
1983-04-01	80.2436696288505
1983-07-01	79.8679130436480
1983-10-01	79.2371632226609
1984-01-01	78.1698459802282
1984-04-01	79.5647349788791
1984-07-01	79.2754866449821
1984-10-01	78.8567532286435
1985-01-01	77.7802616002503
1985-04-01	79.0883809383679
1985-07-01	78.7618129537646
1985-10-01	78.1772708625938
1986-01-01	77.2631437359970
1986-04-01	78.4953844494689
1986-07-01	78.5019682330904
1986-10-01	77.7614870335778
1987-01-01	76.6913407307159
1987-04-01	78.0136390776404
1987-07-01	78.1837076985791
1987-10-01	77.5941341189655
1988-01-01	76.6557066133107
1988-04-01	78.4203111890615
1988-07-01	78.1683803588987
1988-10-01	77.8019917761419
1989-01-01	76.8023775209278
1989-04-01	78.3948334950010
1989-07-01	78.3862535361762
1989-10-01	78.0820933309528
1990-01-01	77.1534718117207
1990-04-01	78.7978648574480
1990-07-01	78.6937406342365
1990-10-01	78.6448821360810
1991-01-01	77.8017828016002
1991-04-01	79.2712009434766
1991-07-01	79.2633520108864
1991-10-01	78.9887586789145
1992-01-01	78.5378303766449
1992-04-01	79.4534761298484
1992-07-01	79.4285512977066
1992-10-01	79.3738049256079
1993-01-01	78.4027409078794
1993-04-01	79.4674989307870
1993-07-01	79.3413153094960
1993-10-01	79.0918159813509
1994-01-01	77.8822635810441
1994-04-01	79.0119041975761
1994-07-01	78.9340677445069
1994-10-01	78.4258548080786
1995-01-01	77.4230161854405
1995-04-01	78.5108314085446
1995-07-01	78.8931877195638
1995-10-01	78.1944027378176
1996-01-01	77.2410114502392
1996-04-01	78.4798353766455
1996-07-01	78.8366772270901
1996-10-01	78.3997844628734
1997-01-01	77.8404317246180
1997-04-01	78.9693793644354
1997-07-01	78.4708226733818
1997-10-01	78.0082819779995
1998-01-01	77.0199091339411
1998-04-01	77.7129725770314
1998-07-01	77.4615706696902
1998-10-01	77.0863110131630
1999-01-01	76.1147284962949
1999-04-01	76.6298684558459
1999-07-01	76.8119331394055
1999-10-01	76.7015370608306
2000-01-01	75.5144709051590
2000-04-01	76.3748029507877
2000-07-01	76.4269064796574
2000-10-01	76.5150017672106
2001-01-01	75.3745439412192
2001-04-01	75.8504068348770
2001-07-01	75.7185811554382
2001-10-01	75.0067346880424
2002-01-01	74.3399779446635
2002-04-01	74.7482656331851
2002-07-01	74.9765221033372
2002-10-01	74.4964104207942
2003-01-01	73.7058847341421
2003-04-01	74.5449433603219
2003-07-01	74.6111366753402
2003-10-01	74.4889877303482
2004-01-01	73.5568291598121
2004-04-01	74.6355348321760
2004-07-01	74.6030143450374
2004-10-01	74.5502600476652
2005-01-01	73.8033694152600
2005-04-01	74.8263651792080
2005-07-01	75.2160943999851
2005-10-01	74.9675392546984
2006-01-01	74.2869604838225
2006-04-01	75.5036838208395
2006-07-01	75.4731357296607
2006-10-01	75.1878268113856
2007-01-01	74.9164481771604
2007-04-01	76.1790759092888
2007-07-01	75.9756180551923
2007-10-01	75.6389274044109
2008-01-01	75.0635706735172
2008-04-01	75.9177688752583
2008-07-01	75.6292254199631
2008-10-01	75.3819264494248
2009-01-01	74.3721398692198
2009-04-01	74.3561235451245
2009-07-01	73.7751612613280
2009-10-01	73.7565733928034
2010-01-01	73.4951086770882
2010-04-01	74.0501500321492
2010-07-01	73.9804225479595
2010-10-01	73.8101753723784
2011-01-01	73.7333795581761
2011-04-01	74.4652795740888
2011-07-01	74.0930185064449
2011-10-01	74.0901451548312
2012-01-01	73.6445946148563
2012-04-01	74.1963559780945
2012-07-01	74.1926483922718
2012-10-01	74.2406041649674
2013-01-01	73.7368503153923
2013-04-01	74.6707395239727
2013-07-01	74.5709271976907
2013-10-01	74.5725736975256
2014-01-01	74.4298461308361
2014-04-01	75.2019321966658
2014-07-01	75.1317109428972
2014-10-01	74.8032017275836
2015-01-01	74.8203546790556
2015-04-01	75.2327288606527
2015-07-01	75.3738283392047
2015-10-01	75.4129247893484
2016-01-01	75.0794996318288
2016-04-01	76.0082217024594
2016-07-01	75.9898731333565
2016-10-01	76.2766889035878
2017-01-01	75.7442868160825
2017-04-01	76.5266448547186
2017-07-01	76.6037723337270
2017-10-01	76.6411346853403
2018-01-01	76.8527226945729
2018-04-01	77.8564153793601
2018-07-01	77.7125746154716