Quarter	Millions of US Dollars
2000-01-01	101
2000-04-01	-756
2000-07-01	878
2000-10-01	-2899
2001-01-01	-653
2001-04-01	273
2001-07-01	3680
2001-10-01	-4253
2002-01-01	-1189
2002-04-01	3113
2002-07-01	5729
2002-10-01	-2016
2003-01-01	5497
2003-04-01	1716
2003-07-01	-846
2003-10-01	-8104
2004-01-01	7516
2004-04-01	-150
2004-07-01	4012
2004-10-01	3500
2005-01-01	-10248
2005-04-01	3023
2005-07-01	-8570
2005-10-01	-4642
2006-01-01	-8041
2006-04-01	-5377
2006-07-01	2096
2006-10-01	-868
2007-01-01	-6842
2007-04-01	-7685
2007-07-01	-504
2007-10-01	2074
2008-01-01	-4026
2008-04-01	-7719
2008-07-01	2997
2008-10-01	16254
2009-01-01	-7102
2009-04-01	2029
2009-07-01	7386
2009-10-01	-2710
2010-01-01	9203
2010-04-01	12453
2010-07-01	4487
2010-10-01	-9560
2011-01-01	455
2011-04-01	6754
2011-07-01	16808
2011-10-01	553
2012-01-01	-3970
2012-04-01	9464
2012-07-01	4454
2012-10-01	-3533
2013-01-01	-954
2013-04-01	-2763
2013-07-01	810
2013-10-01	-7885
2014-01-01	6636
2014-04-01	3696
2014-07-01	8172
2014-10-01	-1951
2015-01-01	4532
2015-04-01	-11311
2015-07-01	718
2015-10-01	-4964
2016-01-01	6347
2016-04-01	8265
2016-07-01	2017
2016-10-01	-14970
2017-01-01	589
2017-04-01	2173
2017-07-01	4493
2017-10-01	-10226
2018-01-01	1572