Quarter	Millions of US Dollars
1996-10-01	200
1997-10-01	350
1999-10-01	100
2000-04-01	350
2002-10-01	-350
2004-10-01	-300
2007-04-01	-350
2014-10-01	3205
2015-01-01	-151
2015-04-01	94
2015-07-01	5366
2015-10-01	210
2016-01-01	4127
2016-04-01	-3802
2016-07-01	124
2016-10-01	62
2017-01-01	104
2017-04-01	48
2017-07-01	-45
2017-10-01	38
2018-01-01	38
2018-04-01	60