Quarter	Percent
1987-01-01	4.40000000000000
1987-04-01	4.00000000000000
1987-07-01	4.00000000000000
1987-10-01	3.30000000000000
1988-01-01	3.50000000000000
1988-04-01	3.70000000000000
1988-07-01	4.00000000000000
1988-10-01	3.20000000000000
1989-01-01	3.20000000000000
1989-04-01	3.00000000000000
1989-07-01	3.30000000000000
1989-10-01	2.50000000000000
1990-01-01	2.50000000000000
1990-04-01	2.80000000000000
1990-07-01	3.10000000000000
1990-10-01	2.60000000000000
1991-01-01	2.70000000000000
1991-04-01	2.30000000000000
1991-07-01	2.90000000000000
1991-10-01	2.60000000000000
1992-01-01	2.90000000000000
1992-04-01	2.80000000000000
1992-07-01	2.90000000000000
1992-10-01	2.70000000000000
1993-01-01	3.50000000000000
1993-04-01	3.20000000000000
1993-07-01	3.70000000000000
1993-10-01	3.30000000000000
1994-01-01	3.70000000000000
1994-04-01	3.60000000000000
1994-07-01	3.90000000000000
1994-10-01	3.60000000000000
1995-01-01	5.10000000000000
1995-04-01	6.30000000000000
1995-07-01	7.40000000000000
1995-10-01	6.10000000000000
1996-01-01	6.00000000000000
1996-04-01	5.60000000000000
1996-07-01	5.50000000000000
1996-10-01	4.70000000000000
1997-01-01	4.29000000000000
1997-04-01	3.86000000000000
1997-07-01	3.67000000000000
1997-10-01	3.11000000000000
1998-01-01	3.50000000000000
1998-04-01	3.20000000000000
1998-07-01	3.17000000000000
1998-10-01	2.77000000000000
1999-01-01	2.91000000000000
1999-04-01	2.57000000000000
1999-07-01	2.33000000000000
1999-10-01	2.20000000000000
2000-01-01	2.29000000000000
2000-04-01	2.55666666666667
2000-07-01	2.85333333333333
2000-10-01	2.32666666666667
2001-01-01	2.88000000000000
2001-04-01	2.55000000000000
2001-07-01	2.78333333333333
2001-10-01	2.81333333333333
2002-01-01	3.23000000000000
2002-04-01	2.86000000000000
2002-07-01	3.13000000000000
2002-10-01	2.69333333333333
2003-01-01	3.07666666666667
2003-04-01	2.96000000000000
2003-07-01	4.03666666666667
2003-10-01	3.55000000000000
2004-01-01	4.02333333333333
2004-04-01	3.66000000000000
2004-07-01	4.24333333333333
2004-10-01	3.73666666666667
2005-01-01	3.84867027486200
2005-04-01	3.48205169688780
2005-07-01	3.78476881607185
2005-10-01	3.12306428137954
2006-01-01	3.53242354559016
2006-04-01	3.13648410218743
2006-07-01	3.99178832116788
2006-10-01	3.59445210870127
2007-01-01	3.94740686548756
2007-04-01	3.33220794351121
2007-07-01	3.84403977889335
2007-10-01	3.46257368844091
2008-01-01	3.87751792147950
2008-04-01	3.43731658099198
2008-07-01	4.11855383439625
2008-10-01	4.18142905912151
2009-01-01	5.00345864728235
2009-04-01	5.11253380517543
2009-07-01	6.14579548045595
2009-10-01	5.23494783390212
2010-01-01	5.29430712849959
2010-04-01	5.16048518950512
2010-07-01	5.56503805486445
2010-10-01	5.29466146361379
2011-01-01	5.15275609394859
2011-04-01	5.23527775047274
2011-07-01	5.53863033422765
2011-10-01	4.85504789837395
2012-01-01	4.91420071411776
2012-04-01	4.80562085202106
2012-07-01	5.10722253623112
2012-10-01	4.86326054918860
2013-01-01	4.89502852485096
2013-04-01	5.00933166833234
2013-07-01	5.23728237766308
2013-10-01	4.63098332917262
2014-01-01	4.80628044544991
2014-04-01	4.89072887900075
2014-07-01	5.24351767567328
2014-10-01	4.38432575170222
2015-01-01	4.23355000963124
2015-04-01	4.34715173410105
2015-07-01	4.59809463041867
2015-10-01	4.16379656220072
2016-01-01	4.04398079021254
2016-04-01	3.93349292247705
2016-07-01	4.02698090093934
2016-10-01	3.53684292344933
2017-01-01	3.39375303175830
2017-04-01	3.45888999071572
2017-07-01	3.55209126223574
2017-10-01	3.34717647545357
2018-01-01	3.13946278064244
2018-04-01	3.33940670825446