Quarter	Millions of US Dollars
1993-07-01	271
1993-10-01	-3
1994-01-01	-10
1994-04-01	1
1994-07-01	-12
1994-10-01	5
1995-01-01	4
1995-04-01	-37
1995-07-01	4
1995-10-01	-2
1996-01-01	-7
1996-04-01	-15
1996-07-01	119
1996-10-01	35
1997-01-01	39
1997-04-01	-9
1997-07-01	-119
1997-10-01	-19
1998-01-01	335
1998-04-01	185
1998-07-01	229
1998-10-01	37
1999-01-01	88
1999-04-01	223
1999-07-01	72
1999-10-01	177
2000-01-01	79
2000-04-01	611
2000-07-01	21
2000-10-01	-52
2001-01-01	-95
2001-04-01	162
2001-07-01	470
2001-10-01	-40
2002-04-01	-225
2002-07-01	4
2002-10-01	118
2003-01-01	1
2003-04-01	-599
2003-07-01	-536
2003-10-01	-24
2004-01-01	27
2004-04-01	-2
2004-10-01	-128
2005-01-01	-21
2005-04-01	283
2005-10-01	194
2006-01-01	-150
2006-10-01	710
2007-04-01	750
2007-07-01	275
2007-10-01	1
2008-01-01	576
2008-04-01	-404
2008-07-01	401
2008-10-01	-236
2009-01-01	1452
2009-04-01	1409
2009-07-01	1
2009-10-01	286
2010-01-01	70
2010-04-01	6
2010-07-01	217
2010-10-01	588
2011-01-01	425
2011-04-01	437
2011-07-01	-500
2011-10-01	729
2012-01-01	400
2012-04-01	576
2012-07-01	1470
2012-10-01	75
2013-01-01	600
2013-04-01	-525
2013-07-01	1619
2013-10-01	344
2014-01-01	500
2014-04-01	-1541
2014-07-01	288
2014-10-01	-451
2015-01-01	562
2015-04-01	582
2015-10-01	665
2016-01-01	-125
2016-04-01	17
2016-07-01	1175
2016-10-01	1885
2017-01-01	925
2017-04-01	209
2017-07-01	1189
2017-10-01	571
2018-01-01	2419
2018-04-01	8363