Quarter	Millions of US Dollars
2002-07-01	5829
2002-10-01	8861
2003-01-01	12456
2003-04-01	3483
2003-07-01	6472
2003-10-01	509
2004-01-01	8350
2004-04-01	8635
2004-07-01	1588
2004-10-01	21648
2005-01-01	15309
2005-04-01	-1104
2005-07-01	2411
2005-10-01	4332
2006-01-01	12685
2006-04-01	16498
2006-07-01	16044
2006-10-01	3394
2007-01-01	19444
2007-04-01	12685
2007-07-01	6684
2007-10-01	9462
2008-01-01	3627
2008-04-01	12977
2008-07-01	5227
2008-10-01	-3723
2009-01-01	9107
2009-04-01	14301
2009-07-01	-6019
2009-10-01	-3810
2010-01-01	2054
2010-04-01	4131
2010-07-01	-11516
2010-10-01	-5290
2011-01-01	-2203
2011-04-01	863
2011-07-01	3019
2011-10-01	-3203
2012-01-01	868
2012-04-01	-6486
2012-07-01	-3254
2012-10-01	4287
2013-01-01	5233
2013-04-01	3183
2013-07-01	5261
2013-10-01	4607
2014-01-01	5568
2014-04-01	2847
2014-07-01	9499
2014-10-01	52702
2015-01-01	9393
2015-04-01	6578
2015-07-01	3557
2015-10-01	380
2016-01-01	5672
2016-04-01	2164
2016-07-01	4330
2016-10-01	-8067
2017-01-01	3292
2017-04-01	10363
2017-07-01	4529
2017-10-01	14643
2018-01-01	9029