Quarter	Millions of US Dollars
1996-01-01	-1835
1996-04-01	469
1996-07-01	615
1996-10-01	1472
1997-01-01	2657
1997-04-01	-2623
1997-07-01	1324
1997-10-01	-74
1998-01-01	402
1998-04-01	-167
1998-07-01	-763
1998-10-01	-1479
1999-01-01	-1121
1999-04-01	349
1999-07-01	439
1999-10-01	422
2000-01-01	-22
2000-04-01	-184
2000-07-01	-259
2000-10-01	2027
2001-01-01	936
2001-04-01	-2908
2001-07-01	758
2001-10-01	265
2002-01-01	-119
2002-04-01	344
2002-07-01	1845
2002-10-01	-618
2003-01-01	5000
2003-04-01	2026
2003-07-01	2802
2003-10-01	-1294
2004-01-01	268
2004-04-01	-232
2004-07-01	-97
2004-10-01	-3005
2005-01-01	-1491
2005-04-01	1672
2005-07-01	-387
2005-10-01	518
2006-01-01	116
2006-04-01	1321
2006-07-01	473
2006-10-01	1948
2007-01-01	-5661
2007-04-01	118
2007-07-01	2211
2007-10-01	905
2008-01-01	1579
2008-04-01	2440
2008-07-01	710
2008-10-01	10745
2009-01-01	7975
2009-04-01	7616
2009-07-01	13526
2009-10-01	2950
2010-01-01	2241
2010-04-01	3060
2010-07-01	110
2010-10-01	-427
2011-01-01	-4042
2011-04-01	-9972
2011-07-01	-273
2011-10-01	-1271
2012-01-01	7183
2012-04-01	3598
2012-07-01	770
2012-10-01	1018
2013-01-01	5918
2013-04-01	-10870
2013-07-01	3012
2013-10-01	-265
2014-01-01	-1468
2014-04-01	-2452
2014-07-01	2437
2014-10-01	3239
2015-01-01	4917
2015-04-01	-5179
2015-07-01	965
2015-10-01	952
2016-01-01	4472
2016-04-01	1547
2016-07-01	-737
2016-10-01	-716
2017-01-01	2253
2017-04-01	-3584
2017-07-01	1425
2017-10-01	989
2018-01-01	1909