Quarter	Millions of US Dollars
2002-04-01	252
2002-07-01	349
2002-10-01	183
2003-01-01	306
2003-04-01	490
2003-07-01	704
2003-10-01	480
2004-01-01	1003
2004-04-01	523
2004-07-01	110
2004-10-01	382
2005-01-01	619
2005-04-01	2068
2005-07-01	1297
2005-10-01	-68
2006-01-01	594
2006-04-01	1132
2006-07-01	1853
2006-10-01	790
2007-01-01	3189
2007-04-01	2996
2007-07-01	-769
2007-10-01	-2118
2008-01-01	1688
2008-04-01	-2172
2008-07-01	-16
2008-10-01	-3457
2009-01-01	-778
2009-04-01	-224
2009-07-01	1828
2009-10-01	68598
2010-01-01	3938
2010-04-01	3893
2010-07-01	2923
2010-10-01	-619
2011-01-01	4120
2011-04-01	4597
2011-07-01	-1896
2011-10-01	100
2012-01-01	4283
2012-04-01	2702
2012-07-01	-40
2012-10-01	1276
2013-01-01	5795
2013-04-01	2413
2013-07-01	2798
2013-10-01	5569
2014-01-01	6155
2014-04-01	12759
2014-07-01	8360
2014-10-01	8999
2015-01-01	7613
2015-04-01	8692
2015-07-01	7599
2015-10-01	29732
2016-01-01	16499
2016-04-01	2164
2016-07-01	11262
2016-10-01	10551
2017-01-01	8443
2017-04-01	20883
2017-07-01	23081
2017-10-01	16468
2018-01-01	15180