Quarter	Millions of US Dollars
1994-04-01	155
2001-04-01	-77
2002-04-01	-77
2003-07-01	120
2005-10-01	600
2008-07-01	-120
2010-01-01	-250
2010-04-01	250
2010-07-01	129
2010-10-01	-540
2011-01-01	501
2011-04-01	-180
2011-07-01	-17
2011-10-01	-47
2012-01-01	42
2012-04-01	219
2012-07-01	32
2012-10-01	179
2013-01-01	935
2013-04-01	-170
2013-07-01	-304
2013-10-01	198
2014-01-01	373
2014-04-01	702
2014-07-01	231
2014-10-01	-252
2015-01-01	-490
2015-04-01	-167
2015-07-01	72
2015-10-01	518
2016-01-01	-86
2016-04-01	79
2016-07-01	-69
2016-10-01	1380
2017-01-01	-166
2017-04-01	-727
2017-07-01	-407
2017-10-01	1077
2018-01-01	4174
2018-04-01	1474