Quarter	Thousands
1997-12-31	47003
1998-03-31	57464
1998-06-30	80330
1998-09-30	82583
1998-12-31	78448
1999-03-31	78908
1999-06-30	93953
1999-09-30	92893
1999-12-31	75318
2000-03-31	87889
2000-06-30	105973
2000-09-30	99428
2000-12-31	112735
2001-03-31	138816
2001-06-30	167201
2001-09-30	156731
2001-12-31	163906
2002-03-31	180215
2002-06-30	210983
2002-09-30	223661
2002-12-31	236854
2003-03-31	235879
2003-06-30	264289
2003-09-30	244827
2003-12-31	240416
2004-03-31	228311
2004-06-30	223287
2004-09-30	220090
2004-12-31	196975
2005-03-31	200783
2005-06-30	218569
2005-09-30	226151
2005-12-31	212386
2006-03-31	202142
2006-06-30	210852
2006-09-30	194748
2006-12-31	204426
2007-03-31	199739
2007-06-30	222538
2007-09-30	211023
2007-12-31	191668
2008-03-31	225592
2008-06-30	227574
2008-09-30	157738
2008-12-31	117093
2009-03-31	85346
2009-06-30	84443
2009-09-30	76604
2009-12-31	65626