Quarter	US dollars
1986-09-30	4616
1986-12-31	8691
1987-03-31	11193
1987-06-30	9127
1987-09-30	10103
1987-12-31	11462
1988-03-31	10935
1988-06-30	9249
1988-09-30	9268
1988-12-31	11062
1989-03-31	10191
1989-06-30	7928
1989-09-30	9092
1989-12-31	11438
1990-03-31	10714
1990-06-30	12488
1990-09-30	16782
1990-12-31	16971
1991-03-31	18671
1991-06-30	16606
1991-09-30	19118
1991-12-31	18675
1992-03-31	12467
1992-06-30	13290
1992-09-30	15664
1992-12-31	15436
1993-03-31	16913
1993-06-30	20814
1993-09-30	24686
1993-12-31	27038
1994-03-31	26432
1994-06-30	28054
1994-09-30	31822
1994-12-31	36053
1995-03-31	74160
1995-06-30	71056
1995-09-30	72672
1995-12-31	66989
1996-03-31	66070
1996-06-30	65164
1996-09-30	65767
1996-12-31	64339
1997-03-31	65576
1997-06-30	68447
1997-09-30	9884
1997-12-31	4872
1998-03-31	3007
1998-06-30	6592
1998-09-30	6546
1998-12-31	10059
1999-03-31	3507
1999-06-30	736
1999-09-30	-1622
1999-12-31	-45
2000-03-31	755
2000-06-30	-2187
2000-09-30	1899
2000-12-31	-381
2001-03-31	2484
2001-06-30	5997
2001-09-30	5879
2001-12-31	3699
2002-03-31	7176
2002-06-30	1147
2002-09-30	881
2002-12-31	3117
2003-03-31	3653
2003-06-30	5549
2003-09-30	7040
2003-12-31	513
2004-03-31	2201
2004-06-30	-502
2004-09-30	-2206
2004-12-31	-4557
2005-03-31	95
2005-06-30	2418
2005-09-30	245
2005-12-31	1864
2006-03-31	5490
2006-06-30	971
2006-09-30	-692
2006-12-31	12147
2007-03-31	-2201
2007-06-30	9254
2007-09-30	9628
2007-12-31	226
2008-03-31	-2595
2008-06-30	8079
2008-09-30	5525
2008-12-31	8771
2009-03-31	2420
2009-06-30	2142
2009-09-30	-2051
2009-12-31	79
2010-03-31	2901
2010-06-30	5473
2010-09-30	1626
2010-12-31	2059
2011-03-31	3967
2011-06-30	1160
2011-09-30	-641
2011-12-31	3580
2012-03-31	6570
2012-06-30	4122
2012-09-30	1321
2012-12-31	2795
2013-03-31	-1673
2013-06-30	3656
2013-09-30	-1160
2013-12-31	-3446
2014-03-31	6702
2014-06-30	5245
2014-09-30	3257
2014-12-31	1047
2015-03-31	5389
2015-06-30	7364
2015-09-30	2043
2015-12-31	-53