Quarter	Millions of US Dollars
1994-04-01	40
1997-04-01	110
2002-04-01	-50
2004-04-01	-100
2005-10-01	227
2007-07-01	165
2007-10-01	14
2009-01-01	101
2009-04-01	25
2009-07-01	40
2009-10-01	200
2010-01-01	103
2010-04-01	195
2010-07-01	140
2010-10-01	50
2011-01-01	343
2011-04-01	-10
2011-10-01	320
2012-01-01	725
2012-04-01	997
2012-07-01	495
2012-10-01	-14
2013-01-01	1368
2013-04-01	2155
2013-07-01	-15
2013-10-01	441
2014-01-01	800
2014-04-01	482
2014-07-01	971
2014-10-01	774
2015-01-01	206
2015-04-01	-250
2015-07-01	-28
2016-04-01	123
2016-07-01	-210
2017-01-01	-200
2017-04-01	3550
2017-07-01	1090
2018-01-01	562
2018-04-01	770