Quarter	Millions of US Dollars
2007-10-01	200
2008-01-01	116
2008-04-01	100
2008-07-01	144
2008-10-01	96
2009-01-01	145
2009-04-01	136
2009-07-01	110
2009-10-01	87
2010-01-01	97
2010-04-01	76
2010-07-01	39
2010-10-01	24
2011-01-01	24
2011-04-01	59
2011-07-01	70
2011-10-01	74
2012-01-01	81
2012-04-01	76
2012-07-01	67
2012-10-01	107
2013-01-01	89
2013-04-01	80
2013-07-01	85
2013-10-01	27
2014-01-01	29
2014-04-01	32
2014-07-01	31
2014-10-01	44
2015-01-01	49
2015-04-01	52
2015-07-01	55
2015-10-01	57
2016-01-01	64
2016-04-01	128
2016-07-01	121
2016-10-01	114
2017-01-01	101
2017-04-01	77
2017-07-01	123
2017-10-01	127
2018-01-01	129