Quarter	Millions of US Dollars
1979-07-01	273
1979-10-01	141
1981-07-01	47
1981-10-01	47
1982-01-01	53
1982-04-01	50
1983-01-01	191
1983-04-01	50
1983-07-01	42
1983-10-01	450
1984-01-01	144
1984-04-01	188
1984-07-01	577
1984-10-01	400
1985-01-01	435
1985-04-01	333
1985-07-01	600
1985-10-01	173
1986-01-01	1050
1986-04-01	753
1986-07-01	462
1986-10-01	426
1987-01-01	63
1987-04-01	83
1987-07-01	346
1987-10-01	-287
1988-01-01	-21
1988-04-01	146
1988-07-01	67
1988-10-01	500
1989-01-01	-168
1989-04-01	2
1989-07-01	320
1989-10-01	401
1990-01-01	296
1990-04-01	1108
1990-07-01	-140
1990-10-01	193
1991-01-01	1121
1991-04-01	101
1991-07-01	-41
1991-10-01	484
1992-01-01	174
1992-04-01	-62
1992-07-01	-339
1992-10-01	129
1993-01-01	143
1993-04-01	266
1993-07-01	301
1993-10-01	597
1994-01-01	268
1994-04-01	-57
1994-07-01	704
1994-10-01	1289
1995-01-01	419
1995-04-01	943
1995-07-01	147
1995-10-01	-422
1996-01-01	-1311
1996-04-01	-765
1996-07-01	-1446
1996-10-01	-584
1997-01-01	-140
1997-04-01	-345
1997-07-01	17
1997-10-01	464
1998-01-01	-550
1998-04-01	-1101
1998-07-01	-704
1998-10-01	-592
1999-01-01	-125
1999-04-01	-466
1999-07-01	-500
1999-10-01	-1649
2000-01-01	-500
2000-04-01	-280
2000-07-01	-197
2001-01-01	4106
2001-04-01	4298
2001-07-01	-411
2001-10-01	-600
2002-01-01	3691
2002-04-01	-1357
2003-10-01	-1608
2004-01-01	375
2004-04-01	196
2004-10-01	-709
2005-04-01	94
2005-07-01	-500
2006-07-01	-6371
2007-01-01	35
2007-04-01	6863
2008-01-01	-913
2008-04-01	7952
2008-07-01	2000
2008-10-01	1
2009-01-01	298
2009-04-01	6920
2009-07-01	3393
2010-01-01	8036
2010-04-01	109
2010-07-01	284
2010-10-01	299
2011-01-01	21
2011-04-01	1036
2011-07-01	-6919
2011-10-01	717
2012-01-01	-4961
2012-04-01	656
2012-07-01	-7864
2013-01-01	-6019
2013-04-01	1452
2013-07-01	3828
2013-10-01	0
2014-01-01	-7133
2014-04-01	57
2014-07-01	-262
2014-10-01	367
2015-01-01	-4
2015-04-01	131
2015-07-01	179
2015-10-01	118
2016-01-01	-4271
2016-04-01	842
2016-07-01	3046
2016-10-01	388
2017-01-01	194
2017-04-01	-524
2017-07-01	-510
2017-10-01	1745
2018-01-01	-1439
2018-04-01	-308