Quarter	Percent
1999-07-01	36.5544398615195
1999-10-01	38.4145996199561
2000-01-01	43.6811543108067
2000-04-01	38.6713158238290
2000-07-01	38.6255846587870
2000-10-01	40.6828318122034
2001-01-01	45.3390269342250
2001-04-01	38.2475448612544
2001-07-01	38.1835278401177
2001-10-01	39.3368900109483
2002-01-01	42.8517324997578
2002-04-01	37.9300518496699
2002-07-01	37.9273748503709
2002-10-01	39.2143342549952
2003-01-01	44.5386002115283
2003-04-01	39.7100161564213
2003-07-01	39.9118002371235
2003-10-01	40.0493603383831
2004-01-01	42.3249937446856
2004-04-01	38.8492820645213
2004-07-01	39.1706420146490
2004-10-01	39.2483170322207
2005-01-01	42.4195358793463
2005-04-01	37.7295329791579
2005-07-01	38.5593280663635
2005-10-01	39.3612409495235
2006-01-01	41.7438023957152
2006-04-01	37.2277989928996
2006-07-01	38.2579156395072
2006-10-01	37.3780929408979
2007-01-01	40.2192210123231
2007-04-01	35.6411118712292
2007-07-01	36.5470807806129
2007-10-01	37.4781851896931
2008-01-01	40.3884289836253
2008-04-01	36.3966842947282
2008-07-01	37.0536174329648
2008-10-01	37.8531720856490
2009-01-01	40.8675864582275
2009-04-01	36.5652242974186
2009-07-01	36.8418843875370
2009-10-01	37.4675590655944
2010-01-01	39.7845314793200
2010-04-01	35.7314815879850
2010-07-01	36.3677659821277
2010-10-01	36.9806006802972
2011-01-01	39.3189678664021
2011-04-01	35.0297603526647
2011-07-01	35.6687751899056
2011-10-01	35.4983408422857
2012-01-01	37.7441604079718
2012-04-01	33.6262727409961
2012-07-01	34.6636394615558
2012-10-01	35.0144506251368
2013-01-01	37.4110637881811
2013-04-01	32.8803840683428
2013-07-01	33.1909516290623
2013-10-01	33.5078000491057
2014-01-01	34.7367458458944
2014-04-01	31.1935505985215
2014-07-01	32.0405421778158
2014-10-01	32.2928391815064
2015-01-01	33.6387610226219
2015-04-01	31.3945195412244
2015-07-01	31.4591021438861
2015-10-01	31.9707856177990
2016-01-01	33.9641354745795
2016-04-01	31.5123749509476
2016-07-01	31.1384901181675
2016-10-01	31.2120932628226
2017-01-01	32.5421237933047
2017-04-01	30.1253159606782
2017-07-01	30.3578711688701
2017-10-01	30.4310374221710
2018-01-01	32.3779766044470
2018-04-01	30.3224869861215
2018-07-01	30.8075194505806