Quarter	Millions of US Dollars
2002-04-01	0
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	1675
2003-07-01	2608
2003-10-01	0
2004-01-01	3489
2004-04-01	1731
2004-07-01	1415
2004-10-01	0
2005-01-01	6893
2005-04-01	6817
2005-07-01	1919
2005-10-01	0
2006-01-01	3088
2006-04-01	0
2006-07-01	1881
2006-10-01	0
2007-01-01	0
2007-04-01	4
2007-07-01	2
2007-10-01	2
2008-01-01	0
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	442
2009-07-01	399
2009-10-01	207
2010-01-01	735
2010-04-01	510
2010-07-01	132
2010-10-01	0
2011-01-01	2011
2011-04-01	2810
2011-07-01	0
2011-10-01	0
2012-01-01	4405
2012-04-01	7648
2012-07-01	4337
2012-10-01	0
2013-01-01	8590
2013-04-01	10995
2013-07-01	8172
2013-10-01	5
2014-01-01	10445
2014-04-01	11963
2014-07-01	5770
2014-10-01	39
2015-01-01	9491
2015-04-01	9487
2015-07-01	8043
2015-10-01	267
2016-01-01	6769
2016-04-01	5791
2016-07-01	3640
2016-10-01	1043
2017-01-01	7475
2017-04-01	1705
2017-07-01	1694
2017-10-01	606
2018-01-01	2730