Quarter	Millions of US Dollars
1989-04-01	16655
1989-07-01	11519
1989-10-01	8644
1990-01-01	7004
1990-04-01	13705
1990-07-01	11687
1990-10-01	7682
1991-01-01	11335
1991-04-01	10214
1991-07-01	14825
1991-10-01	419
1992-01-01	300
1992-04-01	18457
1992-07-01	7832
1992-10-01	-6018
1993-01-01	10221
1993-04-01	16884
1993-07-01	7070
1993-10-01	8796
1994-01-01	7728
1994-04-01	10422
1994-07-01	6932
1994-10-01	-573
1995-01-01	6793
1995-04-01	13019
1995-07-01	12383
1995-10-01	1425
1996-01-01	7708
1996-04-01	4910
1996-07-01	2002
1996-10-01	1319
1997-01-01	10856
1997-04-01	5264
1997-07-01	6226
1997-10-01	11993
1998-01-01	10457
1998-04-01	11169
1998-07-01	-2503
1998-10-01	777
1999-01-01	18134
1999-04-01	6679
1999-07-01	5883
1999-10-01	15386
2000-01-01	7271
2000-04-01	12415
2000-07-01	980
2000-10-01	2926
2001-01-01	2843
2001-04-01	186
2001-07-01	5334
2001-10-01	6282
2002-01-01	3770
2002-04-01	4633
2002-07-01	914
2002-10-01	-818
2003-01-01	7988
2003-04-01	4243
2003-07-01	4113
2003-10-01	3787
2004-01-01	8839
2004-04-01	8663
2004-07-01	1740
2004-10-01	13235
2005-01-01	22826
2005-04-01	1713
2005-07-01	9886
2005-10-01	10835
2006-01-01	26223
2006-04-01	2290
2006-07-01	13406
2006-10-01	17371
2007-01-01	16159
2007-04-01	-5360
2007-07-01	-16927
2007-10-01	-2900
2008-01-01	14735
2008-04-01	3152
2008-07-01	-1517
2008-10-01	41056
2009-01-01	35704
2009-04-01	12648
2009-07-01	25240
2009-10-01	10216
2010-01-01	25861
2010-04-01	28102
2010-07-01	19881
2010-10-01	29455
2011-01-01	27884
2011-04-01	33875
2011-07-01	23615
2011-10-01	13535
2012-01-01	38973
2012-04-01	30696
2012-07-01	26504
2012-10-01	21268
2013-01-01	38176
2013-04-01	37304
2013-07-01	42388
2013-10-01	6933
2014-01-01	-3328
2014-04-01	35833
2014-07-01	21813
2014-10-01	-718
2015-01-01	19248
2015-04-01	19510
2015-07-01	21012
2015-10-01	13959
2016-01-01	5578
2016-04-01	29131
2016-07-01	20208
2016-10-01	5107
2017-01-01	11174
2017-04-01	38234
2017-07-01	11953
2017-10-01	736
2018-01-01	9514