Quarter	Millions of US Dollars
2000-01-01	-5701
2000-04-01	39
2000-07-01	-3940
2000-10-01	2855
2001-01-01	-611
2001-04-01	-2081
2001-07-01	6170
2001-10-01	-1560
2002-01-01	780
2002-04-01	9438
2002-07-01	-594
2002-10-01	14430
2003-01-01	2160
2003-04-01	2921
2003-07-01	5082
2003-10-01	7803
2004-01-01	1521
2004-04-01	3842
2004-07-01	3466
2004-10-01	10607
2005-01-01	-2649
2005-04-01	-7631
2005-07-01	-474
2005-10-01	-263
2006-01-01	4833
2006-04-01	1893
2006-07-01	-3202
2006-10-01	2457
2007-01-01	-321
2007-04-01	-4389
2007-07-01	5277
2007-10-01	4713
2008-01-01	12640
2008-04-01	-4386
2008-07-01	-9719
2008-10-01	5890
2009-01-01	-14081
2009-04-01	5930
2009-07-01	5193
2009-10-01	-4675
2010-01-01	-1067
2010-04-01	2064
2010-07-01	1882
2010-10-01	7305
2011-01-01	4074
2011-04-01	6062
2011-07-01	-7981
2011-10-01	-2971
2012-01-01	12618
2012-04-01	-14225
2012-07-01	1914
2012-10-01	8183
2013-01-01	-7414
2013-04-01	1191
2013-07-01	9308
2013-10-01	83
2014-01-01	2886
2014-04-01	1421
2014-07-01	-6841
2014-10-01	-4983
2015-01-01	4748
2015-04-01	183
2015-07-01	-7110
2015-10-01	466
2016-01-01	1968
2016-04-01	-3860
2016-07-01	1790
2016-10-01	-6958
2017-01-01	3772
2017-04-01	423
2017-07-01	-1158
2017-10-01	1145
2018-01-01	-3236