Quarterly Millions of US Dollars
1987-07-01 -201
1987-10-01 1566
1988-01-01 623
1988-04-01 1484
1988-07-01 753
1988-10-01 3687
1989-01-01 1105
1989-04-01 -2185
1989-07-01 -830
1989-10-01 -2990
1990-01-01 -1667
1990-04-01 -85
1990-07-01 -206
1990-10-01 71
1991-01-01 3017
1991-04-01 1605
1991-07-01 4947
1991-10-01 -19
1992-01-01 3465
1992-04-01 9218
1992-07-01 -6406
1992-10-01 532
1993-01-01 1607
1993-04-01 -437
1993-07-01 1234
1993-10-01 2149
1994-01-01 1502
1994-04-01 -1530
1994-07-01 -606
1994-10-01 2962
1995-01-01 529
1995-04-01 -1466
1995-07-01 1081
1995-10-01 1987
1996-01-01 339
1996-04-01 -882
1996-07-01 3086
1996-10-01 2521
1997-01-01 1047
1997-04-01 -1085
1997-07-01 -601
1997-10-01 1893
1998-01-01 467
1998-04-01 -794
1998-07-01 997
1998-10-01 662
1999-01-01 2151
1999-04-01 3
1999-07-01 3639
1999-10-01 3484
2000-01-01 2627
2000-04-01 -108
2000-07-01 -138
2000-10-01 1742
2001-01-01 4158
2001-04-01 806
2001-07-01 3345
2001-10-01 2938
2002-01-01 4160
2002-04-01 3192
2002-07-01 4262
2002-10-01 2437
2003-01-01 4445
2003-04-01 226
2003-07-01 1025
2003-10-01 1679
2004-01-01 3179
2004-04-01 1317
2004-07-01 3026
2004-10-01 2602
2005-01-01 2605
2005-04-01 1705
2005-07-01 295
2005-10-01 1762
2006-01-01 1393
2006-04-01 2929
2006-07-01 2367
2006-10-01 127
2007-01-01 1131
2007-04-01 2275
2007-07-01 -1394
2007-10-01 2211
2008-01-01 5423
2008-04-01 3677
2008-07-01 -1954
2008-10-01 2488
2009-01-01 6569
2009-04-01 2482
2009-07-01 -1911
2009-10-01 3135
2010-01-01 3772
2010-04-01 2190
2010-07-01 639
2010-10-01 6096
2011-01-01 -35
2011-04-01 3779
2011-07-01 -660
2011-10-01 5367
2012-01-01 -168
2012-04-01 4520
2012-07-01 1024
2012-10-01 4996
2013-01-01 4180
2013-04-01 1397
2013-07-01 1618
2013-10-01 2676
2014-01-01 1328
2014-04-01 3336
2014-07-01 -3088
2014-10-01 3160
2015-01-01 -32
2015-04-01 1702
2015-07-01 -1825
2015-10-01 2969
2016-01-01 848
2016-04-01 932
2016-07-01 -3265
2016-10-01 2498
2017-01-01 1727
2017-04-01 -953
2017-07-01 -2966
2017-10-01 1096
2018-01-01 -340