Quarter	Thousands
2001-03-31	154247
2001-06-30	184923
2001-09-30	178009
2001-12-31	193366
2002-03-31	211029
2002-06-30	243004
2002-09-30	255879
2002-12-31	283435
2003-03-31	289107
2003-06-30	332648
2003-09-30	321233
2003-12-31	306285
2004-03-31	278901
2004-06-30	285041
2004-09-30	278628
2004-12-31	238780
2005-03-31	239293
2005-06-30	264590
2005-09-30	287563
2005-12-31	260269
2006-03-31	245585
2006-06-30	255285
2006-09-30	244702
2006-12-31	248482
2007-03-31	247329
2007-06-30	258930
2007-09-30	247831
2007-12-31	233979
2008-03-31	275884
2008-06-30	268359
2008-09-30	199650
2008-12-31	146362
2009-03-31	91701
2009-06-30	96229
2009-09-30	85465
2009-12-31	70482
2010-03-31	78257
2010-06-30	80031
2010-09-30	82279
2010-12-31	87416
2011-03-31	98604
2011-06-30	87701
2011-09-30	95972
2011-12-31	89476
2012-03-31	83069
2012-06-30	78015
2012-09-30	72325
2012-12-31	76997
2013-03-31	74071
2013-06-30	90170
2013-09-30	97589
2013-12-31	96507
2014-03-31	91165
2014-06-30	82998
2014-09-30	88529
2014-12-31	85139
2015-03-31	84460
2015-06-30	100243
2015-09-30	113242
2015-12-31	107132
2016-03-31	105078
2016-06-30	119883
2016-09-30	121930
2016-12-31	124145
2017-03-31	119468
2017-06-30	115774
2017-09-30	127309
2017-12-31	139769
2018-03-31	116994
2018-06-30	131641
2018-09-30	133361
2018-12-31	133938
2019-03-31	126429
2019-06-30	126135
2019-09-30	136489
2019-12-31	138115
2020-03-31	129542
2020-06-30	85875
2020-09-30	92779
2020-12-31	94187
2021-03-31	89005
2021-06-30	88898
2021-09-30	108797
2021-12-31	124707
2022-03-31	129429
2022-06-30	114125
2022-09-30	137578
2022-12-31	104696
2023-03-31	78202
2023-06-30	90707
2023-09-30	76158
2023-12-31	69927