Quarter	Millions of US Dollars
1995-01-01	4392
1995-04-01	4486
1995-07-01	3638
1995-10-01	3059
1996-01-01	2275
1996-04-01	1580
1996-07-01	1420
1996-10-01	1399
1997-01-01	1368
1997-04-01	1301
1997-07-01	1298
1997-10-01	1268
1998-01-01	965
1998-04-01	1031
1998-07-01	1007
1998-10-01	935
1999-01-01	722
1999-04-01	620
1999-07-01	567
1999-10-01	395
2000-01-01	330
2000-04-01	306
2000-07-01	253
2000-10-01	188
2001-01-01	207
2001-04-01	197
2001-07-01	206
2001-10-01	241
2002-01-01	243
2002-04-01	304
2002-07-01	371
2002-10-01	481
2003-01-01	998
2003-04-01	1206
2003-07-01	1392
2003-10-01	2897
2004-01-01	2873
2004-04-01	2967
2004-07-01	3436
2004-10-01	4416
2005-01-01	4909
2005-04-01	4689
2005-07-01	4716
2005-10-01	5268
2006-01-01	5892
2006-04-01	6775
2006-07-01	7039
2006-10-01	7354
2007-01-01	7420
2007-04-01	8790
2007-07-01	9332
2007-10-01	10518
2008-01-01	12804
2008-04-01	13766
2008-07-01	13761
2008-10-01	16892
2009-01-01	15812
2009-04-01	19562
2009-07-01	19540
2009-10-01	17956
2010-01-01	20142
2010-04-01	57325
2010-07-01	70284
2010-10-01	97338
2011-01-01	110207
2011-04-01	114777
2011-07-01	109464
2011-10-01	117735
2012-01-01	127090
2012-04-01	108610
2012-07-01	99970
2012-10-01	94724
2013-01-01	86882
2013-04-01	88067
2013-07-01	89319
2013-10-01	90833
2014-01-01	90829
2014-04-01	77340
2014-07-01	68985
2014-10-01	66335
2015-01-01	57204
2015-04-01	69727
2015-07-01	65599
2015-10-01	56665
2016-01-01	40471
2016-04-01	26231
2016-07-01	15719
2016-10-01	11422
2017-01-01	11672
2017-04-01	10871
2017-07-01	12469
2017-10-01	15241
2018-01-01	18888