Quarter	Millions of US Dollars
1989-04-01	1262
1989-07-01	3203
1989-10-01	24
1990-01-01	2950
1990-04-01	472
1990-07-01	1153
1990-10-01	564
1991-01-01	694
1991-04-01	1698
1991-07-01	1317
1991-10-01	-506
1992-01-01	1781
1992-04-01	174
1992-07-01	-200
1992-10-01	-330
1993-01-01	804
1993-04-01	257
1993-07-01	478
1993-10-01	-317
1994-01-01	1781
1994-04-01	723
1994-07-01	911
1994-10-01	983
1995-01-01	-811
1995-04-01	550
1995-07-01	2600
1995-10-01	539
1996-01-01	-44
1996-04-01	692
1996-07-01	2
1996-10-01	1494
1997-01-01	1811
1997-04-01	1352
1997-07-01	3394
1997-10-01	2221
1998-01-01	4108
1998-04-01	2574
1998-07-01	990
1998-10-01	-3263
1999-01-01	3294
1999-04-01	645
1999-07-01	2620
1999-10-01	1643
2000-01-01	1599
2000-04-01	4180
2000-07-01	2224
2000-10-01	580
2001-01-01	-1032
2001-04-01	2886
2001-07-01	1803
2001-10-01	746
2002-01-01	2791
2002-04-01	-3399
2002-07-01	838
2002-10-01	-171
2003-01-01	713
2003-04-01	1738
2003-07-01	854
2003-10-01	-407
2004-01-01	154
2004-04-01	976
2004-07-01	298
2004-10-01	1968
2005-01-01	902
2005-04-01	-429
2005-07-01	1312
2005-10-01	964
2006-01-01	-1488
2006-04-01	-1020
2006-07-01	2125
2006-10-01	365
2007-01-01	1237
2007-04-01	-1448
2007-07-01	-798
2007-10-01	620
2008-01-01	4750
2008-04-01	1204
2008-07-01	815
2008-10-01	-2701
2009-01-01	2891
2009-04-01	5182
2009-07-01	1210
2009-10-01	7587
2010-01-01	4618
2010-04-01	4015
2010-07-01	3533
2010-10-01	7006
2011-01-01	6893
2011-04-01	8310
2011-07-01	4459
2011-10-01	-394
2012-01-01	4022
2012-04-01	4653
2012-07-01	3289
2012-10-01	6557
2013-01-01	5096
2013-04-01	8286
2013-07-01	12384
2013-10-01	3808
2014-01-01	7157
2014-04-01	6401
2014-07-01	9584
2014-10-01	-1587
2015-01-01	4260
2015-04-01	674
2015-07-01	5037
2015-10-01	1190
2016-01-01	416
2016-04-01	-317
2016-07-01	2465
2016-10-01	2831
2017-01-01	1731
2017-04-01	4880
2017-07-01	7749
2017-10-01	2537
2018-01-01	6051