Quarter	Millions of US Dollars
1989-04-01	14617
1989-07-01	6052
1989-10-01	7615
1990-01-01	2856
1990-04-01	9543
1990-07-01	10052
1990-10-01	11326
1991-01-01	11832
1991-04-01	12302
1991-07-01	12198
1991-10-01	3672
1992-01-01	6629
1992-04-01	15383
1992-07-01	9394
1992-10-01	1382
1993-01-01	10208
1993-04-01	11789
1993-07-01	4130
1993-10-01	5556
1994-01-01	5646
1994-04-01	8870
1994-07-01	4746
1994-10-01	-951
1995-01-01	3718
1995-04-01	10657
1995-07-01	7970
1995-10-01	78
1996-01-01	5458
1996-04-01	1283
1996-07-01	-543
1996-10-01	-4398
1997-01-01	1094
1997-04-01	-2180
1997-07-01	-3361
1997-10-01	3988
1998-01-01	-123
1998-04-01	-1326
1998-07-01	-8225
1998-10-01	1021
1999-01-01	6747
1999-04-01	1678
1999-07-01	988
1999-10-01	7045
2000-01-01	-1386
2000-04-01	3659
2000-07-01	-4273
2000-10-01	-432
2001-01-01	2768
2001-04-01	-396
2001-07-01	2616
2001-10-01	4810
2002-01-01	3419
2002-04-01	6732
2002-07-01	-174
2002-10-01	-486
2003-01-01	4187
2003-04-01	2653
2003-07-01	1595
2003-10-01	2573
2004-01-01	5136
2004-04-01	2779
2004-07-01	-2088
2004-10-01	2447
2005-01-01	12334
2005-04-01	-2553
2005-07-01	-91
2005-10-01	440
2006-01-01	9960
2006-04-01	-5391
2006-07-01	4142
2006-10-01	3262
2007-01-01	10631
2007-04-01	-14352
2007-07-01	2016
2007-10-01	7851
2008-01-01	5550
2008-04-01	13751
2008-07-01	9776
2008-10-01	52034
2009-01-01	40403
2009-04-01	16179
2009-07-01	33192
2009-10-01	16728
2010-01-01	19935
2010-04-01	18731
2010-07-01	19258
2010-10-01	17043
2011-01-01	16738
2011-04-01	26626
2011-07-01	14701
2011-10-01	13286
2012-01-01	13160
2012-04-01	25997
2012-07-01	20028
2012-10-01	12613
2013-01-01	22896
2013-04-01	23945
2013-07-01	19833
2013-10-01	169
2014-01-01	-22019
2014-04-01	22421
2014-07-01	5711
2014-10-01	2293
2015-01-01	5187
2015-04-01	14700
2015-07-01	18155
2015-10-01	9866
2016-01-01	3975
2016-04-01	20286
2016-07-01	8518
2016-10-01	11469
2017-01-01	8183
2017-04-01	31198
2017-07-01	-1661
2017-10-01	634
2018-01-01	2185