Quarter	Millions of US Dollars
2004-10-01	0
2005-01-01	0
2005-04-01	0
2005-07-01	0
2005-10-01	0
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	14
2007-01-01	14
2007-04-01	15
2007-07-01	17
2007-10-01	17
2008-01-01	15
2008-04-01	16
2008-07-01	16
2008-10-01	0
2009-01-01	0
2009-04-01	0
2009-07-01	0
2009-10-01	0
2010-01-01	0
2010-04-01	64
2010-07-01	118
2010-10-01	323
2011-01-01	324
2011-04-01	325
2011-07-01	309
2011-10-01	310
2012-01-01	370
2012-04-01	354
2012-07-01	343
2012-10-01	2042
2013-01-01	2472
2013-04-01	3901
2013-07-01	4612
2013-10-01	5162
2014-01-01	5314
2014-04-01	6545
2014-07-01	7304
2014-10-01	7961
2015-01-01	7988
2015-04-01	8133
2015-07-01	7831
2015-10-01	8513
2016-01-01	8784
2016-04-01	8511
2016-07-01	8383
2016-10-01	7992
2017-01-01	8089
2017-04-01	8249
2017-07-01	8234
2017-10-01	8807
2018-01-01	9557