Quarter	Millions of US Dollars
1996-07-01	290
1996-10-01	286
1997-01-01	265
1997-04-01	255
1997-07-01	253
1997-10-01	250
1998-01-01	243
1998-04-01	248
1998-07-01	267
1998-10-01	267
1999-01-01	246
1999-04-01	379
1999-07-01	392
1999-10-01	369
2000-01-01	351
2000-04-01	351
2000-07-01	322
2000-10-01	342
2001-01-01	324
2001-04-01	312
2001-07-01	335
2001-10-01	324
2002-01-01	320
2002-04-01	366
2002-07-01	137
2002-10-01	145
2003-01-01	151
2003-04-01	158
2003-07-01	628
2003-10-01	680
2004-01-01	659
2004-04-01	486
2004-07-01	496
2004-10-01	545
2005-01-01	519
2005-04-01	484
2005-07-01	482
2005-10-01	472
2006-01-01	484
2006-04-01	509
2006-07-01	506
2006-10-01	527
2007-01-01	533
2007-04-01	1215
2007-07-01	1276
2007-10-01	1325
2008-01-01	1423
2008-04-01	1419
2008-07-01	715
2008-10-01	696
2009-01-01	665
2009-04-01	707
2009-07-01	732
2009-10-01	720
2010-01-01	674
2010-04-01	614
2010-07-01	682
2010-10-01	2004
2011-01-01	2131
2011-04-01	2168
2011-07-01	2025
2011-10-01	1941
2012-01-01	2003
2012-04-01	1889
2012-07-01	1940
2012-10-01	3479
2013-01-01	3421
2013-04-01	3462
2013-07-01	3526
2013-10-01	3569
2014-01-01	3568
2014-04-01	4914
2014-07-01	4646
2014-10-01	4535
2015-01-01	4190
2015-04-01	4297
2015-07-01	4301
2015-10-01	4222
2016-01-01	4346
2016-04-01	4275
2016-07-01	4290
2016-10-01	4448
2017-01-01	4486
2017-04-01	4096
2017-07-01	4174
2017-10-01	4212
2018-01-01	4277
2018-04-01	4145