Quarter	Millions of US Dollars
2000-04-01	6524
2000-07-01	4830
2000-10-01	1873
2001-01-01	2803
2001-04-01	1515
2001-07-01	4947
2001-10-01	4232
2002-01-01	1391
2002-04-01	2501
2002-07-01	28758
2002-10-01	2919
2003-01-01	-9756
2003-04-01	26381
2003-07-01	35723
2003-10-01	-6392
2004-01-01	36700
2004-04-01	30687
2004-07-01	7372
2004-10-01	58732
2005-01-01	57598
2005-04-01	52274
2005-07-01	27159
2005-10-01	59562
2006-01-01	98317
2006-04-01	30818
2006-07-01	39919
2006-10-01	23983
2007-01-01	126336
2007-04-01	9598
2007-07-01	33848
2007-10-01	-25578
2008-01-01	117867
2008-04-01	53716
2008-07-01	84225
2008-10-01	36755
2009-01-01	-52729
2009-04-01	-2205
2009-07-01	30121
2009-10-01	86376
2010-01-01	47349
2010-04-01	82283
2010-07-01	11249
2010-10-01	-39051
2011-01-01	-58741
2011-04-01	391
2011-07-01	-33106
2011-10-01	41998
2012-01-01	47475
2012-04-01	26719
2012-07-01	53368
2012-10-01	27654
2013-01-01	70347
2013-04-01	-45262
2013-07-01	1438
2013-10-01	45524
2014-01-01	109062
2014-04-01	54373
2014-07-01	71613
2014-10-01	64065
2015-01-01	227237
2015-04-01	204374
2015-07-01	316433
2015-10-01	188656
2016-01-01	208555
2016-04-01	204540
2016-07-01	162315
2016-10-01	141069
2017-01-01	280460
2017-04-01	74295
2017-07-01	179730
2017-10-01	84370
2018-01-01	143351