Quarter	Millions of US Dollars
1993-07-01	249
1993-10-01	98
1994-01-01	119
1994-04-01	-114
1994-07-01	419
1994-10-01	-18
1995-01-01	-496
1995-04-01	-17
1995-07-01	210
1995-10-01	187
1996-01-01	354
1996-04-01	338
1996-07-01	299
1996-10-01	1128
1997-01-01	937
1997-04-01	633
1997-07-01	346
1997-10-01	44
1998-01-01	325
1998-04-01	1401
1998-07-01	1743
1998-10-01	238
1999-01-01	1787
1999-04-01	-102
1999-07-01	45
1999-10-01	498
2000-01-01	701
2000-04-01	1049
2000-07-01	165
2000-10-01	1969
2001-01-01	2109
2001-04-01	1345
2001-07-01	111
2001-10-01	1559
2002-01-01	498
2002-04-01	-554
2002-07-01	101
2002-10-01	112
2003-01-01	-1728
2003-04-01	-15
2003-07-01	-39
2003-10-01	-106
2004-01-01	-17
2004-04-01	-304
2004-07-01	728
2004-10-01	1473
2005-01-01	1866
2005-04-01	2958
2005-07-01	2257
2005-10-01	939
2006-01-01	2545
2006-04-01	3879
2006-07-01	2134
2006-10-01	2770
2007-01-01	5476
2007-04-01	2440
2007-07-01	-907
2007-10-01	147
2008-01-01	3296
2008-04-01	821
2008-07-01	3629
2008-10-01	-1900
2009-01-01	-4783
2009-04-01	10239
2009-07-01	1192
2009-10-01	-152
2010-01-01	3075
2010-04-01	-1584
2010-07-01	-1387
2010-10-01	-2111
2011-01-01	-7934
2011-04-01	-2808
2011-07-01	-838
2011-10-01	-1069
2012-01-01	-1025
2012-04-01	-957
2012-07-01	-427
2012-10-01	-1841
2013-01-01	1281
2013-04-01	-1860
2013-07-01	-1394
2013-10-01	-2301
2014-01-01	-1782
2014-04-01	-853
2014-07-01	916
2014-10-01	688
2015-01-01	5376
2015-04-01	5038
2015-07-01	443
2015-10-01	-1076
2016-01-01	779
2016-04-01	-417
2016-07-01	-8963
2016-10-01	-206
2017-01-01	-1565
2017-04-01	-788
2017-07-01	-487
2017-10-01	-713
2018-01-01	-1364
2018-04-01	-3353