Quarterly
1986-09-30 12638
1986-12-31 12885
1987-03-31 12196
1987-06-30 13153
1987-09-30 12713
1987-12-31 13271
1988-03-31 12812
1988-06-30 13900
1988-09-30 13504
1988-12-31 14710
1989-03-31 14165
1989-06-30 13927
1989-09-30 13005
1989-12-31 13754
1990-03-31 13103
1990-06-30 12253
1990-09-30 12630
1990-12-31 12109
1991-03-31 12867
1991-06-30 9960
1991-09-30 10102
1991-12-31 10627
1992-03-31 8989
1992-06-30 8715
1992-09-30 11140
1992-12-31 8600
1993-03-31 8064
1993-06-30 6930
1993-09-30 6355
1993-12-31 7146
1994-03-31 6312
1994-06-30 5289
1994-09-30 4611
1994-12-31 3022
1995-03-31 2834
1995-06-30 4740
1995-09-30 5714
1995-12-31 3668
1996-03-31 2688
1996-06-30 2026
1996-09-30 1683
1996-12-31 2184
1997-03-31 1865
1997-06-30 3490
1997-09-30 2501
1997-12-31 2363
1998-03-31 2594
1998-06-30 3684
1998-09-30 3046
1998-12-31 2589
1999-03-31 3926
1999-06-30 4082
1999-09-30 3706
1999-12-31 4041
2000-03-31 3102
2000-06-30 3283
2000-09-30 2468
2000-12-31 3771
2001-03-31 2866
2001-06-30 4970
2001-09-30 3898
2001-12-31 4509
2002-03-31 4866
2002-06-30 4278
2002-09-30 5999
2002-12-31 4762
2003-03-31 5899
2003-06-30 5970
2003-09-30 13945
2003-12-31 8893
2004-03-31 14475
2004-06-30 17717
2004-09-30 32113
2004-12-31 23323
2005-03-31 31246
2005-06-30 26121
2005-09-30 36248
2005-12-31 32772
2006-03-31 38434
2006-06-30 29995
2006-09-30 39689
2006-12-31 19707
2007-03-31 38200
2007-06-30 38041
2007-09-30 37758
2007-12-31 28437
2008-03-31 35242
2008-06-30 25489
2008-09-30 25718
2008-12-31 13139
2009-03-31 17864
2009-06-30 30481
2009-09-30 20280
2009-12-31 15457
2010-03-31 20967
2010-06-30 22154
2010-09-30 20449
2010-12-31 18370
2011-03-31 17822
2011-06-30 20776
2011-09-30 14052
2011-12-31 9997
2012-03-31 10186
2012-06-30 4070
2012-09-30 7442
2012-12-31 9249
2013-03-31 14887
2013-06-30 21464
2013-09-30 8727
2013-12-31 14269
2014-03-31 18717
2014-06-30 13702
2014-09-30 10858
2014-12-31 11087
2015-03-31 10034
2015-06-30 16616
2015-09-30 23392
2015-12-31 20640