Quarter	Thousands
1987-03-31	229000
1987-06-30	291000
1987-09-30	287000
1987-12-31	269000
1988-03-31	317000
1988-06-30	379000
1988-09-30	302000
1988-12-31	213000
1989-03-31	201000
1989-06-30	262000
1989-09-30	210000
1989-12-31	185000
1990-03-31	186000
1990-06-30	183000
1990-09-30	179000
1990-12-31	173000
1991-03-31	150000
1991-06-30	190000
1991-09-30	171000
1991-12-31	150000
1992-03-31	144000
1992-06-30	159000
1992-09-30	130000
1992-12-31	98000
1993-03-31	121000
1993-06-30	158000
1993-09-30	145000
1993-12-31	137000
1994-03-31	147000
1994-06-30	171000
1994-09-30	150000
1994-12-31	134000
1995-03-31	124000
1995-06-30	141000
1995-09-30	122000
1995-12-31	126000
1996-03-31	127000
1996-06-30	158000
1996-09-30	159000
1996-12-31	145000
1997-03-31	122000
1997-06-30	138000
1997-09-30	85000
1997-12-31	51000
1998-03-31	56000
1998-06-30	66000
1998-09-30	64000
1998-12-31	44000
1999-03-31	67000
1999-06-30	96000
1999-09-30	82000
1999-12-31	59000
2000-03-31	62000
2000-06-30	86000
2000-09-30	90000
2000-12-31	73000
2001-03-31	63761
2001-06-30	57065
2001-09-30	54519
2001-12-31	49318
2002-03-31	54808
2002-06-30	74196
2002-09-30	62172
2002-12-31	55279
2003-03-31	43255
2003-06-30	51000
2003-09-30	53527
2003-12-31	47577
2004-03-31	47855
2004-06-30	57172
2004-09-30	35920
2004-12-31	32594
2005-03-31	40137
2005-06-30	52839
2005-09-30	45259
2005-12-31	42503
2006-03-31	50871
2006-06-30	73431
2006-09-30	70568
2006-12-31	51571
2007-03-31	61018
2007-06-30	65783
2007-09-30	60008
2007-12-31	46290
2008-03-31	31280
2008-06-30	29352
2008-09-30	24819
2008-12-31	17535
2009-03-31	16931
2009-06-30	30544
2009-09-30	28234
2009-12-31	27914