Quarter	Millions of US Dollars
2004-10-01	0
2005-01-01	0
2005-04-01	0
2005-07-01	0
2005-10-01	10
2006-01-01	10
2006-04-01	8
2006-07-01	75
2006-10-01	80
2007-01-01	82
2007-04-01	76
2007-07-01	628
2007-10-01	1152
2008-01-01	336
2008-04-01	375
2008-07-01	402
2008-10-01	363
2009-01-01	261
2009-04-01	268
2009-07-01	312
2009-10-01	345
2010-01-01	481
2010-04-01	534
2010-07-01	821
2010-10-01	1737
2011-01-01	3682
2011-04-01	6496
2011-07-01	6773
2011-10-01	7305
2012-01-01	10377
2012-04-01	13356
2012-07-01	14243
2012-10-01	14989
2013-01-01	15868
2013-04-01	14872
2013-07-01	14362
2013-10-01	15041
2014-01-01	15181
2014-04-01	16083
2014-07-01	16375
2014-10-01	16351
2015-01-01	14213
2015-04-01	13741
2015-07-01	12723
2015-10-01	13558
2016-01-01	14884
2016-04-01	14388
2016-07-01	13782
2016-10-01	11931
2017-01-01	12294
2017-04-01	13245
2017-07-01	16328
2017-10-01	17674
2018-01-01	19226