Quarter	US dollars
1986-09-30	3490
1986-12-31	3125
1987-03-31	3902
1987-06-30	4957
1987-09-30	6101
1987-12-31	8082
1988-03-31	6944
1988-06-30	7653
1988-09-30	7231
1988-12-31	6855
1989-03-31	6710
1989-06-30	6623
1989-09-30	7174
1989-12-31	6670
1990-03-31	7603
1990-06-30	8807
1990-09-30	11275
1990-12-31	11695
1991-03-31	9570
1991-06-30	9907
1991-09-30	9503
1991-12-31	9239
1992-03-31	7257
1992-06-30	7416
1992-09-30	7554
1992-12-31	7435
1993-03-31	7551
1993-06-30	7837
1993-09-30	7143
1993-12-31	5378
1994-03-31	7083
1994-06-30	8458
1994-09-30	7422
1994-12-31	7789
1995-03-31	11513
1995-06-30	11792
1995-09-30	11936
1995-12-31	16310
1996-03-31	21531
1996-06-30	22371
1996-09-30	24758
1996-12-31	22829
1997-03-31	26912
1997-06-30	30694
1997-09-30	28952
1997-12-31	32024
1998-03-31	32707
1998-06-30	33572
1998-09-30	40352
1998-12-31	40378
1999-03-31	48760
1999-06-30	45245
1999-09-30	52185
1999-12-31	59226
2000-03-31	62606
2000-06-30	55304
2000-09-30	52388
2000-12-31	50984
2001-03-31	48137
2001-06-30	51706
2001-09-30	48218
2001-12-31	49359
2002-03-31	54384
2002-06-30	52904
2002-09-30	58920
2002-12-31	54847
2003-03-31	49125
2003-06-30	44886
2003-09-30	50444
2003-12-31	48265
2004-03-31	51174
2004-06-30	59872
2004-09-30	70187
2004-12-31	85895
2005-03-31	86198
2005-06-30	95666
2005-09-30	78326
2005-12-31	76490
2006-03-31	87442
2006-06-30	70847
2006-09-30	67343
2006-12-31	100194
2007-03-31	111454
2007-06-30	89850
2007-09-30	105588
2007-12-31	104533
2008-03-31	171907
2008-06-30	99894
2008-09-30	118205
2008-12-31	79322
2009-03-31	64783
2009-06-30	75831
2009-09-30	77849
2009-12-31	77186
2010-03-31	65556
2010-06-30	77388
2010-09-30	81670
2010-12-31	72763
2011-03-31	78845
2011-06-30	81370
2011-09-30	88994
2011-12-31	105248
2012-03-31	98015
2012-06-30	95148
2012-09-30	93539
2012-12-31	76379
2013-03-31	83168
2013-06-30	90509
2013-09-30	90383
2013-12-31	79115
2014-03-31	79500
2014-06-30	84150
2014-09-30	79925
2014-12-31	79529
2015-03-31	72775
2015-06-30	64192
2015-09-30	62212
2015-12-31	65375