Quarter	Millions of US Dollars
2008-01-01	88
2008-04-01	331
2008-07-01	-287
2008-10-01	6
2009-01-01	59
2009-04-01	193
2009-07-01	210
2009-10-01	155
2010-01-01	166
2010-04-01	490
2010-07-01	351
2010-10-01	1531
2011-01-01	12
2011-04-01	-2
2011-07-01	98
2011-10-01	116
2012-01-01	685
2012-04-01	81
2012-07-01	235
2012-10-01	104
2013-01-01	774
2013-04-01	433
2013-07-01	-64
2013-10-01	184
2014-01-01	127
2014-04-01	457
2014-07-01	427
2014-10-01	1654
2015-01-01	957
2015-04-01	102
2015-07-01	228
2015-10-01	71
2016-01-01	781
2016-04-01	505
2016-07-01	829
2016-10-01	2472
2017-01-01	1508
2017-04-01	1260
2017-07-01	3974
2017-10-01	412
2018-01-01	371