Quarter	Thousands
2001-03-31	582943
2001-06-30	731603
2001-09-30	706496
2001-12-31	656630
2002-03-31	730859
2002-06-30	882738
2002-09-30	854074
2002-12-31	841259
2003-03-31	820944
2003-06-30	961850
2003-09-30	991539
2003-12-31	897265
2004-03-31	855865
2004-06-30	905173
2004-09-30	788615
2004-12-31	615436
2005-03-31	625637
2005-06-30	759868
2005-09-30	769088
2005-12-31	693998
2006-03-31	700822
2006-06-30	785603
2006-09-30	750958
2006-12-31	699811
2007-03-31	695868
2007-06-30	758599
2007-09-30	691774
2007-12-31	565039
2008-03-31	582294
2008-06-30	543739
2008-09-30	417568
2008-12-31	312496
2009-03-31	283762
2009-06-30	338668
2009-09-30	336865
2009-12-31	297196
2010-03-31	273940
2010-06-30	312591
2010-09-30	295599
2010-12-31	260493
2011-03-31	268992
2011-06-30	291236
2011-09-30	308219
2011-12-31	275609
2012-03-31	267732
2012-06-30	281054
2012-09-30	264028
2012-12-31	258837
2013-03-31	238918
2013-06-30	312853
2013-09-30	325919
2013-12-31	322455
2014-03-31	302588
2014-06-30	311721
2014-09-30	310549
2014-12-31	269209
2015-03-31	262557
2015-06-30	341732
2015-09-30	363520
2015-12-31	329327
2016-03-31	321956
2016-06-30	376982
2016-09-30	353536
2016-12-31	344723
2017-03-31	342198
2017-06-30	366291
2017-09-30	370706
2017-12-31	350501
2018-03-31	319828
2018-06-30	378989
2018-09-30	369930
2018-12-31	345843
2019-03-31	334240
2019-06-30	375181
2019-09-30	381045
2019-12-31	353830
2020-03-31	341408
2020-06-30	175742
2020-09-30	370131
2020-12-31	398667
2021-03-31	353166
2021-06-30	380776
2021-09-30	361845
2021-12-31	345657
2022-03-31	363296
2022-06-30	357163
2022-09-30	381790
2022-12-31	256026
2023-03-31	223034
2023-06-30	277079
2023-09-30	233451
2023-12-31	215405