Quarter	Percent
1999-07-01	38.4660189202555
1999-10-01	38.4946391362527
2000-01-01	40.1018769245723
2000-04-01	38.3746307696663
2000-07-01	38.1627951396464
2000-10-01	38.5547226881088
2001-01-01	40.2504564961091
2001-04-01	37.7792001861174
2001-07-01	37.9502189472647
2001-10-01	38.0585087936998
2002-01-01	39.0909619813576
2002-04-01	37.1866482768488
2002-07-01	37.4735896384038
2002-10-01	37.8910272107900
2003-01-01	39.4664814399403
2003-04-01	37.9713054110379
2003-07-01	38.1111175928974
2003-10-01	38.0772553322888
2004-01-01	38.5297493307649
2004-04-01	37.1336719240306
2004-07-01	37.5308323993154
2004-10-01	37.4845790067109
2005-01-01	38.7134105568062
2005-04-01	37.0671114375995
2005-07-01	37.5666383486266
2005-10-01	37.7716777903816
2006-01-01	38.8359007691705
2006-04-01	37.1345385416561
2006-07-01	37.5604387997949
2006-10-01	37.7276715775191
2007-01-01	38.8765456920242
2007-04-01	37.0796669238494
2007-07-01	37.5760351352136
2007-10-01	37.8608682419169
2008-01-01	39.2333903278275
2008-04-01	37.4219777272970
2008-07-01	37.9832698627773
2008-10-01	38.4717392793090
2009-01-01	40.1605061899356
2009-04-01	38.1921925717604
2009-07-01	38.5166505147600
2009-10-01	39.1535751119341
2010-01-01	40.0763786882139
2010-04-01	38.0743957503648
2010-07-01	38.3510911515317
2010-10-01	38.9780899844756
2011-01-01	39.9104280209323
2011-04-01	37.7384264750243
2011-07-01	38.3214328410884
2011-10-01	38.6540824059139
2012-01-01	39.6205128923289
2012-04-01	37.4559416646233
2012-07-01	37.8918868198883
2012-10-01	38.6620594269767
2013-01-01	39.9001742395400
2013-04-01	37.6075996184270
2013-07-01	37.6536570035469
2013-10-01	37.9878292949392
2014-01-01	38.4232090541255
2014-04-01	36.6599608194819
2014-07-01	36.7430790394967
2014-10-01	37.3486682347876
2015-01-01	38.1834610737528
2015-04-01	36.6085460363351
2015-07-01	36.7277403443419
2015-10-01	37.2914445894104
2016-01-01	38.1300554981267
2016-04-01	36.7024553660069
2016-07-01	36.5384147703890
2016-10-01	37.1212836246936
2017-01-01	37.7837906626377
2017-04-01	36.2340276759789
2017-07-01	36.4040641537824
2017-10-01	36.9292512751771
2018-01-01	37.7070430715611
2018-04-01	36.2849360306829
2018-07-01	36.4864362198904