Quarter	Millions of US Dollars
1995-04-01	358
1995-07-01	578
1995-10-01	229
1996-01-01	448
1996-04-01	-68
1996-07-01	465
1996-10-01	468
1997-01-01	281
1997-04-01	-368
1997-07-01	616
1997-10-01	-402
1998-01-01	-344
1998-04-01	-127
1998-07-01	-25
1998-10-01	-280
1999-01-01	1145
1999-04-01	150
1999-07-01	-266
1999-10-01	536
2000-01-01	510
2000-04-01	-194
2000-07-01	55
2000-10-01	-83
2001-01-01	-170
2001-04-01	503
2001-07-01	-212
2001-10-01	502
2002-01-01	-208
2002-04-01	-225
2002-07-01	-136
2002-10-01	696
2003-01-01	660
2003-04-01	1806
2003-07-01	-260
2003-10-01	714
2004-01-01	-1
2004-04-01	441
2004-07-01	487
2004-10-01	1075
2005-01-01	720
2005-04-01	139
2005-07-01	869
2005-10-01	-61
2006-01-01	464
2006-04-01	429
2006-07-01	1232
2006-10-01	1104
2007-01-01	1103
2007-04-01	536
2007-07-01	2620
2007-10-01	2803
2008-01-01	3588
2008-04-01	4460
2008-07-01	-1889
2008-10-01	-4060
2009-01-01	-740
2009-04-01	4551
2009-07-01	3977
2009-10-01	672
2010-01-01	1896
2010-04-01	-1653
2010-07-01	4824
2010-10-01	2147
2011-01-01	680
2011-04-01	352
2011-07-01	-3344
2011-10-01	22
2012-01-01	2100
2012-04-01	-2344
2012-07-01	1783
2012-10-01	4476
2013-01-01	1589
2013-04-01	1332
2013-07-01	1960
2013-10-01	1509
2014-01-01	-20
2014-04-01	1820
2014-07-01	-3417
2014-10-01	-4017
2015-01-01	-151
2015-04-01	1242
2015-07-01	-1291
2015-10-01	515
2016-01-01	3001
2016-04-01	-595
2016-07-01	1704
2016-10-01	-1836
2017-01-01	3049
2017-04-01	3695
2017-07-01	-427
2017-10-01	798
2018-01-01	-449