Quarter	Percent
1978-04-01	3.48258711173192
1978-07-01	3.48631232206350
1978-10-01	3.35187605765440
1979-01-01	3.42210356228324
1979-04-01	3.22786062881325
1979-07-01	2.95731091751681
1979-10-01	2.87971871088572
1980-01-01	3.39938987673287
1980-04-01	3.29765928746317
1980-07-01	3.18934741774300
1980-10-01	2.83207181549441
1981-01-01	3.09368181357932
1981-04-01	2.98066071922215
1981-07-01	3.21963901433875
1981-10-01	3.17026778794334
1982-01-01	3.65677610660134
1982-04-01	3.67465321399447
1982-07-01	4.48391429927138
1982-10-01	5.59959777322125
1983-01-01	6.90852030086895
1983-04-01	7.20714317701799
1983-07-01	7.18519200855131
1983-10-01	6.42092326383890
1984-01-01	6.75090672225805
1984-04-01	6.20750175658994
1984-07-01	6.14651180746752
1984-10-01	5.59107350829154
1985-01-01	6.05361547478632
1985-04-01	6.00920133282857
1985-07-01	5.52265528191963
1985-10-01	4.94844672502132
1986-01-01	5.43861271069270
1986-04-01	5.38454045282560
1986-07-01	5.61056108050219
1986-10-01	5.50097499996721
1987-01-01	6.05830555567006
1987-04-01	5.82251393455743
1987-07-01	5.57268237125391
1987-10-01	5.20626435180353
1988-01-01	5.11003444044198
1988-04-01	4.89402619766915
1988-07-01	4.65218145451979
1988-10-01	4.38458903710249
1989-01-01	4.70287352160275
1989-04-01	4.24515651064964
1989-07-01	4.11170099108626
1989-10-01	3.64566944222774
1990-01-01	4.37221813199066
1990-04-01	4.35853568268572
1990-07-01	5.06964091886346
1990-10-01	5.68337243154886
1991-01-01	7.00352117705824
1991-04-01	7.36233602037703
1991-07-01	7.88288726907589
1991-10-01	7.88757499174085
1992-01-01	8.62371480366432
1992-04-01	8.57833277377994
1992-07-01	8.75075529733551
1992-10-01	8.84813157053171
1993-01-01	9.57131628865204
1993-04-01	9.27696289685299
1993-07-01	8.90922154717156
1993-10-01	8.62881163413558
1994-01-01	8.98816639836934
1994-04-01	7.92363556071169
1994-07-01	7.51001082429051
1994-10-01	7.03126595457632
1995-01-01	7.52724913778466
1995-04-01	6.90201901683332
1995-07-01	6.83253325671509
1995-10-01	6.55588238810822
1996-01-01	7.09007690262598
1996-04-01	6.67327727482655
1996-07-01	6.76803006448149
1996-10-01	6.42781273501083
1997-01-01	7.13965494501975
1997-04-01	6.75724242727482
1997-07-01	6.57850949229501
1997-10-01	6.17091958817627
1998-01-01	6.70077081275815
1998-04-01	6.30582343119904
1998-07-01	6.42709534602786
1998-10-01	5.89997997309877
1999-01-01	6.03366506583909
1999-04-01	5.58175434868930
1999-07-01	5.49123004760651
1999-10-01	5.18556242623771
2000-01-01	5.54524145379823
2000-04-01	5.08459197450626
2000-07-01	5.02552163942388
2000-10-01	4.93403698897613
2001-01-01	5.53186869722996
2001-04-01	5.38938550165417
2001-07-01	5.43540186465231
2001-10-01	5.26960393724267
2002-01-01	5.75536061159654
2002-04-01	5.21029394340118
2002-07-01	4.78887950369856
2002-10-01	4.50192064784676
2003-01-01	5.00526392145891
2003-04-01	4.83794417863660
2003-07-01	4.39930035684459
2003-10-01	4.08691382121995
2004-01-01	4.30459399281388
2004-04-01	4.09468712602282
2004-07-01	3.92677112313045
2004-10-01	3.50611829684487
2005-01-01	3.86039074335057
2005-04-01	3.68013208275437
2005-07-01	3.55533477264780
2005-10-01	3.51521728621413
2006-01-01	3.96031262522216
2006-04-01	3.46541935202400
2006-07-01	3.28921484523999
2006-10-01	3.05232857819954
2007-01-01	3.31565884021374
2007-04-01	2.95261858291645
2007-07-01	2.74765808738830
2007-10-01	2.79255277550926
2008-01-01	2.83386467036791
2008-04-01	2.96572569944104
2008-07-01	2.89053969904314
2008-10-01	2.93466948477588
2009-01-01	4.40855661880257
2009-04-01	4.88976351338453
2009-07-01	4.50806342562239
2009-10-01	4.23627870739777
2010-01-01	4.22098829527130
2010-04-01	3.86975924491043
2010-07-01	3.53803106200286
2010-10-01	3.35770820244910
2011-01-01	3.50492184632868
2011-04-01	3.43946565749439
2011-07-01	3.67024215444613
2011-10-01	3.67043414729520
2012-01-01	3.95365299051795
2012-04-01	3.59252285368654
2012-07-01	3.89043657924566
2012-10-01	3.74394497199856
2013-01-01	4.36417763374518
2013-04-01	4.41084552789968
2013-07-01	4.33416863182011
2013-10-01	4.62870578617147
2014-01-01	4.77298973178837
2014-04-01	4.38733676267575
2014-07-01	4.70380582489196
2014-10-01	4.49592301432295
2015-01-01	4.87470479059425
2015-04-01	4.41172079807149
2015-07-01	4.78580018458320
2015-10-01	4.17418488750340
2016-01-01	4.48653653354929
2016-04-01	3.94937933803600
2016-07-01	4.02195328603495
2016-10-01	3.91684796730543
2017-01-01	4.43061384225209
2017-04-01	3.91882951368590
2017-07-01	4.08033098696278
2017-10-01	3.83877674387335
2018-01-01	4.15231634699728
2018-04-01	3.89240171665955
2018-07-01	3.74296807766382