Quarter	Percent
1998-01-01	11.83865082543500
1998-04-01	10.84027654671160
1998-07-01	10.79827684733390
1998-10-01	11.41713229794540
1999-01-01	12.15079244298540
1999-04-01	11.85286995222200
1999-07-01	11.71690694626470
1999-10-01	12.66364112410540
2000-01-01	12.30749123227390
2000-04-01	11.24707615004760
2000-07-01	10.89947089947090
2000-10-01	10.95370330194820
2001-01-01	11.23256451919220
2001-04-01	10.45601984354130
2001-07-01	10.23217282324700
2001-10-01	11.24909160860090
2002-01-01	11.40593133922500
2002-04-01	9.97540311560536
2002-07-01	9.84422373235755
2002-10-01	10.20173513118010
2003-01-01	10.43166964991880
2003-04-01	9.41247251151404
2003-07-01	9.32909064611443
2003-10-01	10.00062000124000
2004-01-01	11.41863557328420
2004-04-01	10.31116534472240
2004-07-01	10.16883645240030
2004-10-01	10.46722128429920
2005-01-01	10.52481576483040
2005-04-01	9.75693741138343
2005-07-01	9.83305036785512
2005-10-01	9.86507231154561
2006-01-01	9.82818284242717
2006-04-01	8.86327983588754
2006-07-01	8.43672953957786
2006-10-01	8.90694774107897
2007-01-01	9.23612368479289
2007-04-01	8.20132907707442
2007-07-01	7.97541098496226
2007-10-01	8.17632777543691
2008-01-01	8.39601259602463
2008-04-01	7.32828393852795
2008-07-01	7.27490756470471
2008-10-01	8.04383912321754
2009-01-01	9.49166716444657
2009-04-01	9.03932383635570
2009-07-01	9.43869489650814
2009-10-01	10.49392519653780
2010-01-01	11.89409852958660
2010-04-01	11.99341413580370
2010-07-01	12.56312378225770
2010-10-01	14.41801852259320
2011-01-01	16.10440877323720
2011-04-01	16.51078991052270
2011-07-01	17.94200073108320
2011-10-01	20.92564337300380
2012-01-01	22.81968149099730
2012-04-01	23.76864909053750
2012-07-01	24.93502240959420
2012-10-01	26.24359237236010
2013-01-01	27.60216519978510
2013-04-01	27.30675111558950
2013-07-01	27.20024721878860
2013-10-01	27.75944032716780
2014-01-01	27.81392457521760
2014-04-01	26.56250000000000
2014-07-01	25.52581857442440
2014-10-01	26.05885674844700
2015-01-01	26.63805735817460
2015-04-01	24.55625611253300
2015-07-01	24.01895852305650
2015-10-01	24.39009197932020
2016-01-01	24.89065689173990
2016-04-01	23.09801233721730
2016-07-01	22.62439691052530
2016-10-01	23.55110421992210
2017-01-01	23.34939254294090
2017-04-01	21.14392678868550
2017-07-01	20.23655555091990
2017-10-01	21.22617642098160
2018-01-01	21.18941798941800
2018-04-01	19.00805639476330