Quarter	Millions of US Dollars
2003-04-01	110
2003-07-01	919
2003-10-01	1108
2004-01-01	18
2004-04-01	318
2004-07-01	5
2004-10-01	477
2005-01-01	-269
2005-04-01	477
2005-07-01	413
2005-10-01	1668
2006-01-01	236
2006-04-01	2314
2006-07-01	833
2006-10-01	-54
2007-01-01	-16
2007-04-01	1656
2007-07-01	1061
2007-10-01	-569
2008-01-01	410
2008-04-01	450
2008-07-01	970
2008-10-01	861
2009-01-01	1318
2009-04-01	2362
2009-07-01	1625
2009-10-01	-430
2010-01-01	413
2010-04-01	364
2010-07-01	-235
2010-10-01	838
2011-01-01	838
2011-04-01	115
2011-07-01	183
2011-10-01	359
2012-01-01	2872
2012-04-01	-913
2012-07-01	1554
2012-10-01	761
2013-01-01	1621
2013-04-01	894
2013-07-01	1497
2013-10-01	1186
2014-01-01	2916
2014-04-01	1899
2014-07-01	2800
2014-10-01	1373
2015-01-01	1526
2015-04-01	3083
2015-07-01	2766
2015-10-01	1116
2016-01-01	11267
2016-04-01	2015
2016-07-01	720
2016-10-01	-3761
2017-01-01	1131
2017-04-01	2085
2017-07-01	750
2017-10-01	-76
2018-01-01	2259