Quarter	Millions of US Dollars
2002-01-01	109
2002-04-01	338
2002-07-01	696
2002-10-01	957
2003-01-01	1389
2003-04-01	1967
2003-07-01	2601
2003-10-01	3042
2004-01-01	4136
2004-04-01	4524
2004-07-01	4584
2004-10-01	5005
2005-01-01	5709
2005-04-01	7851
2005-07-01	9093
2005-10-01	8618
2006-01-01	9104
2006-04-01	10208
2006-07-01	12018
2006-10-01	12921
2007-01-01	15971
2007-04-01	19114
2007-07-01	17907
2007-10-01	15831
2008-01-01	17434
2008-04-01	16047
2008-07-01	15556
2008-10-01	10607
2009-01-01	9078
2009-04-01	8678
2009-07-01	10371
2009-10-01	79081
2010-01-01	81610
2010-04-01	84319
2010-07-01	86529
2010-10-01	85682
2011-01-01	88208
2011-04-01	91630
2011-07-01	87544
2011-10-01	85650
2012-01-01	88610
2012-04-01	89778
2012-07-01	85068
2012-10-01	82425
2013-01-01	84948
2013-04-01	83331
2013-07-01	80135
2013-10-01	76776
2014-01-01	68691
2014-04-01	80363
2014-07-01	85415
2014-10-01	94554
2015-01-01	98444
2015-04-01	104177
2015-07-01	108055
2015-10-01	108385
2016-01-01	112359
2016-04-01	112072
2016-07-01	120487
2016-10-01	126689
2017-01-01	139309
2017-04-01	151165
2017-07-01	165298
2017-10-01	169519
2018-01-01	174578