Quarter	Millions of US Dollars
2008-01-01	-285
2008-04-01	245
2008-07-01	28
2008-10-01	-67
2009-01-01	6
2009-04-01	19
2009-07-01	-61
2009-10-01	331
2010-01-01	-107
2010-04-01	143
2010-07-01	61
2010-10-01	-224
2011-01-01	-64
2011-04-01	161
2011-07-01	-142
2011-10-01	-233
2012-01-01	-78
2012-04-01	-119
2012-07-01	-90
2012-10-01	-7
2013-01-01	-28
2013-04-01	-394
2013-07-01	287
2013-10-01	101
2014-01-01	20
2014-04-01	-57
2014-07-01	127
2014-10-01	30
2015-01-01	283
2015-04-01	289
2015-07-01	205
2015-10-01	199
2016-01-01	36
2016-04-01	149
2016-07-01	209
2016-10-01	119
2017-01-01	46
2017-04-01	209
2017-07-01	226
2017-10-01	-64
2018-01-01	-167