Quarter	Millions of US Dollars
2001-10-01	76
2002-10-01	221
2003-10-01	246
2004-10-01	167
2005-10-01	165
2006-10-01	385
2007-01-01	410
2007-04-01	458
2007-07-01	465
2007-10-01	534
2008-01-01	600
2008-04-01	606
2008-07-01	617
2008-10-01	600
2009-01-01	539
2009-04-01	565
2009-07-01	525
2009-10-01	523
2010-01-01	432
2010-04-01	392
2010-07-01	417
2010-10-01	149
2011-01-01	95
2011-04-01	76
2011-07-01	71
2011-10-01	75
2012-01-01	72
2012-04-01	58
2012-07-01	58
2012-10-01	59
2013-01-01	57
2013-04-01	58
2013-07-01	59
2013-10-01	57
2014-01-01	56
2014-04-01	52
2014-07-01	37
2014-10-01	24
2015-01-01	22
2015-04-01	19
2015-07-01	19
2015-10-01	11
2016-01-01	9
2016-04-01	7
2016-07-01	13
2016-10-01	13
2017-01-01	14
2017-04-01	15
2017-07-01	15
2017-10-01	15
2018-01-01	24