Quarter	Percent
1999-01-01	24.0649048499672
1999-04-01	22.8047879414807
1999-07-01	22.8501407711047
1999-10-01	22.3570364428146
2000-01-01	21.6133380631430
2000-04-01	20.3262550977359
2000-07-01	20.2713420997704
2000-10-01	19.6892121279033
2001-01-01	15.6170383305184
2001-04-01	15.0380774121648
2001-07-01	14.9674803615170
2001-10-01	15.2490102104605
2002-01-01	16.3464380727165
2002-04-01	16.0431616715914
2002-07-01	16.2016635811322
2002-10-01	16.0033541895117
2003-01-01	16.7321158514113
2003-04-01	15.6835217729199
2003-07-01	15.5387789900288
2003-10-01	15.4097840286171
2004-01-01	15.5460198552675
2004-04-01	15.0343158979027
2004-07-01	14.3604402903639
2004-10-01	14.3485977161806
2005-01-01	13.4646562905318
2005-04-01	12.0034620991254
2005-07-01	11.0353400006842
2005-10-01	11.4712881066762
2006-01-01	12.0333650885083
2006-04-01	11.2785487924817
2006-07-01	10.9068680958826
2006-10-01	11.1708047945205
2007-01-01	11.2333372341670
2007-04-01	10.3466829844700
2007-07-01	10.3906143897368
2007-10-01	10.8236558251023
2008-01-01	11.8789678476347
2008-04-01	12.0799466213757
2008-07-01	12.4816726586194
2008-10-01	14.8526267035880
2009-01-01	17.7558726889314
2009-04-01	18.0371015400270
2009-07-01	17.9076886963156
2009-10-01	18.8028196440394
2010-01-01	19.9027248641436
2010-04-01	20.3023945180166
2010-07-01	20.1835655934647
2010-10-01	20.5055563504555
2011-01-01	21.6644297857354
2011-04-01	20.9157039745209
2011-07-01	21.7516206459904
2011-10-01	22.9157824245683
2012-01-01	24.4603643709551
2012-04-01	24.3554882777824
2012-07-01	25.0952416523493
2012-10-01	26.2212140730161
2013-01-01	27.2587240239736
2013-04-01	26.7117964851175
2013-07-01	26.1822766706186
2013-10-01	26.5297695022149
2014-01-01	26.5681299401988
2014-04-01	25.3774981844247
2014-07-01	25.0104439633892
2014-10-01	24.7442437223459
2015-01-01	24.9825092181148
2015-04-01	24.0068631219704
2015-07-01	22.6854574078640
2015-10-01	22.5166622736002
2016-01-01	22.7781081004558
2016-04-01	21.8218847666332
2016-07-01	20.6614998774302
2016-10-01	20.2544688011041
2017-01-01	20.5084231869777
2017-04-01	19.0446004503567
2017-07-01	18.2098238829172
2017-10-01	18.3494889299589
2018-01-01	18.5425062823005
2018-04-01	17.0825534476434
2018-07-01	16.2199962199962