Quarter	US dollars
1986-12-31	-311
1987-03-31	2560
1987-06-30	-2449
1987-09-30	1160
1987-12-31	1568
1988-03-31	-3717
1988-06-30	-614
1988-09-30	1008
1988-12-31	-77
1989-03-31	1582
1989-06-30	-2384
1989-09-30	852
1989-12-31	4372
1990-03-31	729
1990-06-30	1673
1990-09-30	6393
1990-12-31	-973
1991-03-31	1715
1991-06-30	2940
1991-09-30	3213
1991-12-31	-3495
1992-03-31	-5746
1992-06-30	2400
1992-09-30	8663
1992-12-31	-15463
1993-03-31	9525
1993-06-30	2629
1993-09-30	6940
1993-12-31	3646
1994-03-31	-66
1994-06-30	2029
1994-09-30	5459
1994-12-31	360
1995-03-31	7999
1995-06-30	-3749
1995-09-30	-884
1995-12-31	-11221
1996-03-31	-842
1996-06-30	-1696
1996-09-30	447
1996-12-31	48
1997-03-31	2167
1997-06-30	-1643
1997-09-30	-44878
1997-12-31	-42865
1998-03-31	-3266
1998-06-30	7855
1998-09-30	3432
1998-12-31	-666
1999-03-31	70835
1999-06-30	58445
1999-09-30	-78678
1999-12-31	-21532
2000-03-31	18657
2000-06-30	2624
2000-09-30	2627
2000-12-31	-31716
2001-03-31	12502
2001-06-30	5939
2001-09-30	179
2001-12-31	1496
2002-03-31	10521
2002-06-30	-13744
2002-09-30	5536
2002-12-31	248
2003-03-31	-6836
2003-06-30	1643
2003-09-30	8592
2003-12-31	-25304
2004-03-31	12686
2004-06-30	682
2004-09-30	-4219
2004-12-31	-20901
2005-03-31	9248
2005-06-30	15586
2005-09-30	-8542
2005-12-31	30110
2006-03-31	435
2006-06-30	-2509
2006-09-30	-3491
2006-12-31	13582
2007-03-31	-3172
2007-06-30	13043
2007-09-30	-11662
2007-12-31	-6714
2008-03-31	-16271
2008-06-30	33764
2008-09-30	25550
2008-12-31	10750
2009-03-31	8884
2009-06-30	-20680
2009-09-30	-32934
2009-12-31	8555
2010-03-31	6062
2010-06-30	6092
2010-09-30	-28388
2010-12-31	16819
2011-03-31	-28809
2011-06-30	-11681
2011-09-30	40202
2011-12-31	7252
2012-03-31	-18929
2012-06-30	13474
2012-09-30	-3044
2012-12-31	11848
2013-03-31	16573
2013-06-30	-20636
2013-09-30	-12639
2013-12-31	-3799
2014-03-31	4936
2014-06-30	-12950
2014-09-30	3936
2014-12-31	10890
2015-03-31	17879
2015-06-30	-5314
2015-09-30	5069
2015-12-31	9147
2016-03-31	12635
2016-06-30	19625
2016-09-30	-5025
2016-12-31	13424
2017-03-31	-2529
2017-06-30	-9389
2017-09-30	-4179
2017-12-31	-958
2018-03-31	-18061
2018-06-30	-2484
2018-09-30	586
2018-12-31	9758
2019-03-31	10643
2019-06-30	13110
2019-09-30	350
2019-12-31	-33125