Quarter	Percent
1999-07-01	51.1318877870477
1999-10-01	49.2622401073105
2000-01-01	43.3960030200163
2000-04-01	50.5343988738255
2000-07-01	50.7515299800305
2000-10-01	47.2834319502997
2001-01-01	41.8515943167203
2001-04-01	50.1213468861639
2001-07-01	50.4514327318724
2001-10-01	48.8153696230174
2002-01-01	44.0926201377672
2002-04-01	49.8913088755744
2002-07-01	49.2093876209319
2002-10-01	47.3375319098129
2003-01-01	41.0099196731673
2003-04-01	47.2283950153133
2003-07-01	47.0444456512275
2003-10-01	46.3424993827764
2004-01-01	43.6542383150463
2004-04-01	47.7931454910796
2004-07-01	47.4981862845570
2004-10-01	46.8078130708566
2005-01-01	43.0339842933947
2005-04-01	47.2550512533909
2005-07-01	46.9430896356451
2005-10-01	45.9188365673864
2006-01-01	42.9044541619543
2006-04-01	47.7938232454624
2006-07-01	46.9643399127057
2006-10-01	48.2152937235536
2007-01-01	43.6103409084747
2007-04-01	49.0243066652237
2007-07-01	47.7521500746754
2007-10-01	47.1409848512485
2008-01-01	44.1059526391831
2008-04-01	49.0016234187327
2008-07-01	48.4908472541922
2008-10-01	47.5640003122182
2009-01-01	43.7670812932191
2009-04-01	48.2029336730560
2009-07-01	47.8552515334110
2009-10-01	46.7065815330003
2010-01-01	43.3574837913828
2010-04-01	48.8730116668733
2010-07-01	48.2862730292938
2010-10-01	47.6794831723990
2011-01-01	44.2394951616248
2011-04-01	49.5395743994073
2011-07-01	49.5733173788652
2011-10-01	49.2495182306006
2012-01-01	46.7862161858835
2012-04-01	50.9233176996437
2012-07-01	49.9765709150427
2012-10-01	50.0099699855756
2013-01-01	47.6023703878408
2013-04-01	52.3242746352063
2013-07-01	51.8772957598598
2013-10-01	51.5421683965282
2014-01-01	49.6024426173418
2014-04-01	53.1375435912799
2014-07-01	53.0955711582311
2014-10-01	52.7639940545114
2015-01-01	50.9674460207718
2015-04-01	53.7537064635426
2015-07-01	54.2361832020726
2015-10-01	53.9350191944300
2016-01-01	51.4828832577809
2016-04-01	54.3524006401695
2016-07-01	54.4053614688733
2016-10-01	54.0885698386371
2017-01-01	52.6692115357419
2017-04-01	55.0828400246515
2017-07-01	55.4600450843587
2017-10-01	55.9006295043333
2018-01-01	53.4356276253121
2018-04-01	55.0942137993227
2018-07-01	54.7505131091159