Quarter	Thousands
2001-03-31	27608
2001-06-30	35640
2001-09-30	39815
2001-12-31	36880
2002-03-31	42830
2002-06-30	48383
2002-09-30	49778
2002-12-31	48765
2003-03-31	57138
2003-06-30	63010
2003-09-30	63411
2003-12-31	55146
2004-03-31	57205
2004-06-30	57367
2004-09-30	50868
2004-12-31	41188
2005-03-31	43383
2005-06-30	49237
2005-09-30	48195
2005-12-31	45311
2006-03-31	46350
2006-06-30	49350
2006-09-30	48125
2006-12-31	42982
2007-03-31	44089
2007-06-30	45319
2007-09-30	43107
2007-12-31	35867
2008-03-31	33698
2008-06-30	31993
2008-09-30	27086
2008-12-31	20435
2009-03-31	18852
2009-06-30	21023
2009-09-30	18865
2009-12-31	15845