Quarter	Millions of US Dollars
2000-04-01	0
2000-07-01	604
2000-10-01	0
2001-01-01	0
2001-04-01	-573
2001-07-01	461
2001-10-01	686
2002-01-01	375
2002-04-01	225
2002-07-01	603
2002-10-01	2506
2003-01-01	761
2003-04-01	-193
2003-07-01	942
2003-10-01	1800
2004-01-01	1148
2004-04-01	163
2004-07-01	1208
2004-10-01	1293
2005-01-01	362
2005-04-01	2996
2005-07-01	8502
2005-10-01	12187
2006-01-01	11321
2006-04-01	10389
2006-07-01	2898
2006-10-01	6879
2007-01-01	-98
2007-04-01	3654
2007-07-01	9626
2007-10-01	17384
2008-01-01	11794
2008-04-01	4309
2008-07-01	18454
2008-10-01	42418
2009-01-01	30328
2009-04-01	53076
2009-07-01	28794
2009-10-01	53784
2010-01-01	37016
2010-04-01	48584
2010-07-01	43585
2010-10-01	22904
2011-01-01	43996
2011-04-01	23555
2011-07-01	13971
2011-10-01	142485
2012-01-01	16312
2012-04-01	169549
2012-07-01	146101
2012-10-01	122476
2013-01-01	63140
2013-04-01	92821
2013-07-01	49725
2013-10-01	46647
2014-01-01	43411
2014-04-01	164055
2014-07-01	80637
2014-10-01	83578
2015-01-01	69895
2015-04-01	71447
2015-07-01	133283
2015-10-01	167756
2016-01-01	207343
2016-04-01	93448
2016-07-01	122092
2016-10-01	44776
2017-01-01	38650
2017-04-01	-20982
2017-07-01	71328
2017-10-01	32072
2018-01-01	122288