Quarter	Millions of US Dollars
1990-04-01	495
1990-07-01	388
1990-10-01	-34
1991-01-01	-748
1991-04-01	663
1991-07-01	978
1991-10-01	193
1992-01-01	154
1992-04-01	689
1992-07-01	78
1992-10-01	184
1993-01-01	26
1993-04-01	921
1993-07-01	385
1993-10-01	-191
1994-01-01	80
1994-04-01	240
1994-07-01	1074
1994-10-01	-162
1995-01-01	-508
1995-04-01	39
1995-07-01	833
1995-10-01	-128
1996-01-01	-600
1996-04-01	1043
1996-07-01	756
1996-10-01	-728
1997-01-01	-1555
1997-04-01	376
1997-07-01	167
1997-10-01	133
1998-01-01	-693
1998-04-01	1139
1998-07-01	-18
1998-10-01	257
1999-01-01	135
1999-04-01	-19
1999-07-01	293
1999-10-01	-4
2000-01-01	-783
2000-04-01	187
2000-07-01	211
2000-10-01	466
2001-01-01	-637
2001-04-01	623
2001-07-01	333
2001-10-01	62
2002-01-01	-400
2002-04-01	444
2002-07-01	278
2002-10-01	537
2003-01-01	84
2003-04-01	-1174
2003-07-01	1853
2003-10-01	152
2004-01-01	-388
2004-04-01	-2125
2004-07-01	915
2004-10-01	484
2005-01-01	-1546
2005-04-01	462
2005-07-01	384
2005-10-01	522
2006-01-01	-1160
2006-04-01	308
2006-07-01	-647
2006-10-01	-2055
2007-01-01	-164
2007-04-01	395
2007-07-01	561
2007-10-01	351
2008-01-01	-155
2008-04-01	115
2008-07-01	-1041
2008-10-01	1615
2009-01-01	1958
2009-04-01	2384
2009-07-01	1232
2009-10-01	1168
2010-01-01	1858
2010-04-01	1555
2010-07-01	2457
2010-10-01	4172
2011-01-01	3200
2011-04-01	4282
2011-07-01	2719
2011-10-01	-2340
2012-01-01	1439
2012-04-01	3674
2012-07-01	845
2012-10-01	3532
2013-01-01	636
2013-04-01	-6176
2013-07-01	1527
2013-10-01	3688
2014-01-01	-267
2014-04-01	-667
2014-07-01	1412
2014-10-01	2416
2015-01-01	1554
2015-04-01	-3167
2015-07-01	-625
2015-10-01	1636
2016-01-01	-940
2016-04-01	1952
2016-07-01	1056
2016-10-01	-534
2017-01-01	726
2017-04-01	-15
2017-07-01	805
2017-10-01	-3104
2018-01-01	2074