Quarter	Millions of US Dollars
2008-01-01	3559
2008-04-01	550
2008-07-01	122
2008-10-01	937
2009-01-01	2980
2009-04-01	1294
2009-07-01	-415
2009-10-01	814
2010-01-01	3161
2010-04-01	2948
2010-07-01	1703
2010-10-01	930
2011-01-01	3341
2011-04-01	-700
2011-07-01	2673
2011-10-01	1430
2012-01-01	1959
2012-04-01	-121
2012-07-01	143
2012-10-01	288
2013-01-01	2735
2013-04-01	1576
2013-07-01	6132
2013-10-01	703
2014-01-01	5428
2014-04-01	907
2014-07-01	1821
2014-10-01	1655
2015-01-01	1908
2015-04-01	3676
2015-07-01	908
2015-10-01	-3635
2016-01-01	4699
2016-04-01	2100
2016-07-01	2801
2016-10-01	957
2017-01-01	4526
2017-04-01	8
2017-07-01	3305
2017-10-01	3644
2018-01-01	4811