Quarter	Millions of US Dollars
2003-10-01	9181
2004-01-01	9956
2004-04-01	10242
2004-07-01	10963
2004-10-01	11182
2005-01-01	8962
2005-04-01	9193
2005-07-01	8186
2005-10-01	9144
2006-01-01	7275
2006-04-01	7844
2006-07-01	7590
2006-10-01	8907
2007-01-01	6846
2007-04-01	7991
2007-07-01	9823
2007-10-01	16576
2008-01-01	15228
2008-04-01	14646
2008-07-01	13229
2008-10-01	11605
2009-01-01	10157
2009-04-01	11209
2009-07-01	12643
2009-10-01	11109
2010-01-01	13056
2010-04-01	11141
2010-07-01	14725
2010-10-01	15459
2011-01-01	17701
2011-04-01	16893
2011-07-01	15495
2011-10-01	16849
2012-01-01	19403
2012-04-01	18616
2012-07-01	22867
2012-10-01	23425
2013-01-01	21081
2013-04-01	21668
2013-07-01	26364
2013-10-01	28635
2014-01-01	30751
2014-04-01	30780
2014-07-01	27279
2014-10-01	31497
2015-01-01	29557
2015-04-01	30569
2015-07-01	31406
2015-10-01	30447
2016-01-01	33077
2016-04-01	31097
2016-07-01	30461
2016-10-01	32739
2017-01-01	31627
2017-04-01	32215
2017-07-01	33963
2017-10-01	35889
2018-01-01	36070