Quarter	Millions of US Dollars
2000-01-01	-1426
2000-04-01	849
2000-07-01	-1690
2000-10-01	898
2001-01-01	-2427
2001-04-01	-2006
2001-07-01	2139
2001-10-01	-1130
2002-01-01	-1155
2002-04-01	3012
2002-07-01	-99
2002-10-01	-642
2003-01-01	-976
2003-04-01	489
2003-07-01	794
2003-10-01	597
2004-01-01	-761
2004-04-01	-61
2004-07-01	616
2004-10-01	2299
2005-01-01	-2971
2005-04-01	-2817
2005-07-01	170
2005-10-01	-1474
2006-01-01	16
2006-04-01	1257
2006-07-01	66
2006-10-01	-182
2007-01-01	-144
2007-04-01	-406
2007-07-01	1919
2007-10-01	1391
2008-01-01	1802
2008-04-01	-431
2008-07-01	-2016
2008-10-01	1621
2009-01-01	-1195
2009-04-01	3217
2009-07-01	5880
2009-10-01	708
2010-01-01	592
2010-04-01	1000
2010-07-01	4885
2010-10-01	2703
2011-01-01	1178
2011-04-01	6634
2011-07-01	-3223
2011-10-01	-654
2012-01-01	4281
2012-04-01	-2065
2012-07-01	2942
2012-10-01	879
2013-01-01	-912
2013-04-01	2653
2013-07-01	1642
2013-10-01	1788
2014-01-01	404
2014-04-01	-567
2014-07-01	-1970
2014-10-01	-1175
2015-01-01	4863
2015-04-01	3861
2015-07-01	-3159
2015-10-01	-484
2016-01-01	1732
2016-04-01	-1158
2016-07-01	539
2016-10-01	-2489
2017-01-01	2001
2017-04-01	4264
2017-07-01	104
2017-10-01	1063
2018-01-01	3258