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	124
2011-01-01	124
2011-04-01	118
2011-07-01	103
2011-10-01	102
2012-01-01	164
2012-04-01	147
2012-07-01	110
2012-10-01	491
2013-01-01	925
2013-04-01	1419
2013-07-01	1625
2013-10-01	1768
2014-01-01	1845
2014-04-01	2132
2014-07-01	2362
2014-10-01	2793
2015-01-01	2681
2015-04-01	2699
2015-07-01	2419
2015-10-01	2662
2016-01-01	2887
2016-04-01	2658
2016-07-01	2607
2016-10-01	2170
2017-01-01	2242
2017-04-01	1866
2017-07-01	1887
2017-10-01	1771
2018-01-01	1823