Quarter	Percent
1998-01-01	16.42459790982940
1998-04-01	16.53608059026430
1998-07-01	15.78959299096670
1998-10-01	16.49003435656970
1999-01-01	16.23122697648060
1999-04-01	16.27083821838120
1999-07-01	15.18333351891240
1999-10-01	15.14891912640050
2000-01-01	15.29415732610820
2000-04-01	14.85760996840690
2000-07-01	14.05317357937770
2000-10-01	13.79661751951430
2001-01-01	13.65999890990350
2001-04-01	13.03045756881980
2001-07-01	12.49704701157570
2001-10-01	12.64261915730160
2002-01-01	12.44819977396260
2002-04-01	12.61004881584280
2002-07-01	11.70995234506840
2002-10-01	12.05645930984750
2003-01-01	11.87182910547400
2003-04-01	11.94524919175380
2003-07-01	11.23116053223470
2003-10-01	11.39237827140630
2004-01-01	11.42263335914260
2004-04-01	10.22141124181940
2004-07-01	9.75559831334179
2004-10-01	10.50814802922050
2005-01-01	10.41919836609650
2005-04-01	9.65174027672750
2005-07-01	9.43576334848202
2005-10-01	10.64944731098440
2006-01-01	9.84481135418038
2006-04-01	8.48184552041496
2006-07-01	7.93290465723031
2006-10-01	8.82412060301508
2007-01-01	7.96614363182746
2007-04-01	7.38993069710558
2007-07-01	7.41705872809864
2007-10-01	8.57310628302995
2008-01-01	8.96777392166584
2008-04-01	8.64582925588132
2008-07-01	7.85573171579188
2008-10-01	8.51074315000986
2009-01-01	9.47289141701929
2009-04-01	8.78689105751903
2009-07-01	8.50610522084318
2009-10-01	10.10999182692780
2010-01-01	10.44397003301110
2010-04-01	9.40281789777752
2010-07-01	8.62512304385384
2010-10-01	9.90180192491654
2011-01-01	9.56091067478418
2011-04-01	8.89722224941988
2011-07-01	8.93422685529908
2011-10-01	10.74894848284520
2012-01-01	12.09966764861390
2012-04-01	11.41984847207780
2012-07-01	11.00674213020800
2012-10-01	12.75761461411240
2013-01-01	13.82444324545570
2013-04-01	12.71971786069370
2013-07-01	12.01042392539070
2013-10-01	13.68078779401000
2014-01-01	14.38135749953760
2014-04-01	13.27171388759870
2014-07-01	12.81897945263080
2014-10-01	14.69046928265760
2015-01-01	13.76379527442410
2015-04-01	12.80270095273330
2015-07-01	11.37705848949460
2015-10-01	12.80386727540450
2016-01-01	12.92901716068640
2016-04-01	12.77511440400960
2016-07-01	11.97961778744260
2016-10-01	13.40348081206870
2017-01-01	13.32969878697020
2017-04-01	12.08382366253280
2017-07-01	11.80167661189980
2017-10-01	12.33134581089110
2018-01-01	12.88654668390180
2018-04-01	11.77396547584110