Quarter	Millions of US Dollars
2005-04-01	3160
2005-07-01	851
2005-10-01	2910
2006-01-01	1398
2006-04-01	487
2006-07-01	-374
2006-10-01	-121
2007-01-01	-344
2007-04-01	3289
2007-07-01	-223
2007-10-01	5098
2008-01-01	-685
2008-04-01	1723
2008-07-01	760
2008-10-01	-370
2009-01-01	-718
2009-04-01	1304
2009-07-01	4074
2009-10-01	2311
2010-01-01	-2590
2010-04-01	3398
2010-07-01	2618
2010-10-01	5309
2011-01-01	-2672
2011-04-01	4161
2011-07-01	2479
2011-10-01	343
2012-01-01	14366
2012-04-01	3569
2012-07-01	6710
2012-10-01	4106
2013-01-01	2438
2013-04-01	-1518
2013-07-01	-2241
2013-10-01	3345
2014-01-01	3332
2014-04-01	-1520
2014-07-01	-528
2014-10-01	-4940
2015-01-01	-431
2015-04-01	1816
2015-07-01	708
2015-10-01	6127
2016-01-01	1420
2016-04-01	1747
2016-07-01	4764
2016-10-01	-547
2017-01-01	2885
2017-04-01	3654
2017-07-01	4107
2017-10-01	5083
2018-01-01	5565