Quarter	Percent
1997-03-31	5.9651
1997-06-30	6.1293
1997-09-30	6.8064
1997-12-31	7.1687
1998-03-31	7.3383
1998-06-30	7.2143
1998-09-30	7.3739
1998-12-31	6.9385
1999-03-31	5.766
1999-06-30	5.1547
1999-09-30	4.9205
1999-12-31	5.0391
2000-03-31	5.6599
2000-06-30	5.9156
2000-09-30	5.9973
2000-12-31	5.8494
2001-03-31	5.7186
2001-06-30	5.2016
2001-09-30	4.9879
2001-12-31	4.2423
2002-03-31	3.9503
2002-06-30	3.741
2002-09-30	3.9535
2002-12-31	4.0412
2003-03-31	3.8174
2003-06-30	3.6533
2003-09-30	3.4342
2003-12-31	3.5541
2004-03-31	3.8995
2004-06-30	4.1585
2004-09-30	4.6076
2004-12-31	4.7441
2005-03-31	4.779
2005-06-30	4.7726
2005-09-30	4.6254
2005-12-31	4.5347
2006-03-31	4.4855
2006-06-30	4.5267
2006-09-30	4.714
2006-12-31	4.9634
2007-03-31	5.2804
2007-06-30	5.465
2007-09-30	5.8614
2007-12-31	5.7269
2008-03-31	5.386
2008-06-30	5.0488
2008-09-30	4.9662
2008-12-31	2.9978
2009-03-31	0.9093
2009-06-30	0.4131
2009-09-30	0.4231
2009-12-31	0.4491
2010-03-31	0.4647
2010-06-30	0.4814
2010-09-30	0.494
2010-12-31	0.5113
2011-03-31	0.5102
2011-06-30	0.5258
2011-09-30	0.5367
2011-12-31	0.5304
2012-03-31	0.5015
2012-06-30	0.4856
2012-09-30	0.4479
2012-12-31	0.43
2013-03-31	0.4233
2013-06-30	0.4329
2013-09-30	0.429
2013-12-31	0.4278
2014-03-31	0.4216
2014-06-30	0.4235
2014-09-30	0.4278
2014-12-31	0.4304
2015-03-31	0.4479
2015-06-30	0.4585
2015-09-30	0.456
2015-12-31	0.4611
2016-03-31	0.4654
2016-06-30	0.4631
2016-09-30	0.3038
2016-12-31	0.2118
2017-03-31	0.2112
2017-06-30	0.2121
2017-09-30	0.2126
2017-12-31	0.3699
2018-03-31	0.4634
2018-06-30	0.455
2018-09-30	0.6129
2018-12-31	0.7018
2019-03-31	0.7055
2019-06-30	0.7087
2019-09-30	0.7096
2019-12-31	0.7105