Quarter	Millions of US Dollars
1992-01-01	2051
2002-04-01	0
2002-10-01	-601
2006-10-01	-1450
2007-01-01	525
2010-01-01	88
2010-07-01	0
2011-01-01	500
2011-04-01	1000
2012-01-01	-525
2012-07-01	102
2013-01-01	473
2013-04-01	300
2013-07-01	1300
2013-10-01	951
2014-04-01	1419
2014-07-01	698
2014-10-01	300
2015-01-01	-75
2015-04-01	1306
2015-07-01	49
2015-10-01	44
2016-01-01	246
2016-04-01	-854
2016-07-01	-31
2016-10-01	1390
2017-01-01	-8
2017-04-01	2438
2017-07-01	69
2017-10-01	3969
2018-01-01	1912
2018-04-01	878