Quarter	Percent
1997-01-01	3.5338
1997-04-01	3.4542
1997-07-01	3.4352
1997-10-01	3.6878
1998-01-01	3.7317
1998-04-01	4.0817
1998-07-01	4.2879
1998-10-01	3.9603
1999-01-01	3.4139
1999-04-01	2.8888
1999-07-01	2.8591
1999-10-01	3.1221
2000-01-01	3.6486
2000-04-01	4.5207
2000-07-01	4.9110
2000-10-01	5.1471
2001-01-01	5.2417
2001-04-01	5.0875
2001-07-01	4.4594
2001-10-01	3.4913
2002-01-01	3.5242
2002-04-01	3.5621
2002-07-01	3.5016
2002-10-01	3.0355
2003-01-01	2.7988
2003-04-01	2.1943
2003-07-01	2.1363
2003-10-01	2.1221
2004-01-01	2.1596
2004-04-01	2.1634
2004-07-01	2.1323
2004-10-01	2.1380
2005-01-01	2.1145
2005-04-01	2.1632
2005-07-01	2.1444
2005-10-01	2.3647
2006-01-01	2.6231
2006-04-01	2.8815
2006-07-01	3.1801
2006-10-01	3.6853
2007-01-01	3.8791
2007-04-01	4.2048
2007-07-01	4.2137
2007-10-01	4.2407
2008-01-01	4.2048
2008-04-01	4.2411
2008-07-01	4.4818
2008-10-01	4.3975
2009-01-01	2.3158
2009-04-01	1.4525
2009-07-01	1.1325
2009-10-01	0.9520
2010-01-01	0.7855
2010-04-01	0.5418
2010-07-01	0.5178
2010-10-01	0.7254
2011-01-01	0.6978
2011-04-01	0.9980
2011-07-01	1.0588
2011-10-01	0.4449
2012-01-01	0.2831
2012-04-01	0.0277
2012-07-01	-0.1000
2012-10-01	-0.0651
2013-01-01	-0.0260
2013-04-01	-0.0007
2013-07-01	-0.0130
2013-10-01	-0.0183
2014-01-01	-0.0162
2014-04-01	0.1046
2014-07-01	0.0589
2014-10-01	0.0400
2015-01-01	-0.2800
2015-04-01	-0.2300
2015-07-01	-0.1100
2015-10-01	-0.2100
2016-01-01	-0.1500
2016-04-01	-0.2600
2016-07-01	-0.2400
2016-10-01	-0.3900
2017-01-01	-0.4700
2017-04-01	-0.4600
2017-07-01	-0.5200
2017-10-01	-0.4900
2018-01-01	-0.4700
2018-04-01	-0.5200
2018-07-01	-0.5100