Quarter	Thousands
2001-03-31	15431
2001-06-30	17722
2001-09-30	21278
2001-12-31	29460
2002-03-31	30814
2002-06-30	32021
2002-09-30	32218
2002-12-31	46581
2003-03-31	53229
2003-06-30	68360
2003-09-30	76405
2003-12-31	65869
2004-03-31	50591
2004-06-30	61754
2004-09-30	58538
2004-12-31	41805
2005-03-31	38510
2005-06-30	46021
2005-09-30	61412
2005-12-31	47883
2006-03-31	43444
2006-06-30	44433
2006-09-30	49954
2006-12-31	44056
2007-03-31	47590
2007-06-30	36392
2007-09-30	36809
2007-12-31	42311
2008-03-31	50293
2008-06-30	40785
2008-09-30	41912
2008-12-31	29269
2009-03-31	6355
2009-06-30	11786
2009-09-30	8861
2009-12-31	4855