Quarter	Millions of US Dollars
1982-07-01	19
1984-01-01	121
1984-07-01	20
1985-01-01	19
1985-04-01	48
1985-07-01	88
1985-10-01	41
1986-01-01	82
1986-04-01	166
1986-07-01	125
1987-01-01	98
1987-04-01	174
1987-07-01	277
1988-01-01	300
1988-04-01	655
1988-10-01	700
1989-10-01	-100
1990-07-01	-4
1990-10-01	-700
1991-01-01	-741
1991-07-01	-3
1992-04-01	-93
1992-07-01	-146
1993-01-01	600
1993-04-01	-335
1993-07-01	775
1993-10-01	1000
1994-01-01	700
1994-04-01	-120
1994-07-01	1517
1994-10-01	549
1995-01-01	900
1995-04-01	1331
1995-07-01	-105
1995-10-01	959
1996-01-01	380
1996-04-01	1035
1996-07-01	55
1996-10-01	-156
1997-01-01	515
1997-04-01	740
1997-07-01	479
1997-10-01	744
1998-01-01	734
1998-04-01	92
1998-07-01	5
1998-10-01	-17
1999-01-01	-1538
1999-04-01	-21
1999-07-01	-290
1999-10-01	734
2000-01-01	-491
2000-04-01	-849
2000-07-01	-80
2000-10-01	118
2001-01-01	368
2001-04-01	219
2001-07-01	758
2001-10-01	797
2002-01-01	-240
2002-04-01	-621
2002-07-01	685
2002-10-01	-390
2003-01-01	2382
2003-04-01	1170
2003-07-01	-91
2003-10-01	-3
2004-01-01	-717
2004-07-01	-1000
2005-01-01	-65
2005-04-01	-1037
2005-10-01	3476
2006-01-01	3605
2006-07-01	641
2007-04-01	3182
2007-07-01	-2747
2007-10-01	-353
2008-01-01	3993
2008-04-01	-1003
2008-07-01	-137
2008-10-01	2051
2009-01-01	3144
2009-04-01	4109
2009-07-01	1918
2009-10-01	2932
2010-01-01	30
2010-04-01	-165
2010-07-01	1948
2010-10-01	-2024
2011-01-01	2839
2011-04-01	-7606
2011-07-01	227
2011-10-01	209
2012-01-01	-745
2012-04-01	-128
2012-07-01	-3112
2012-10-01	2593
2013-01-01	-1186
2013-04-01	-87
2013-07-01	-7
2013-10-01	-14
2014-01-01	-1828
2014-04-01	-3427
2014-07-01	4493
2014-10-01	-5441
2015-01-01	-1318
2015-10-01	-55
2016-04-01	-215
2016-10-01	-3223
2017-01-01	-3119
2017-04-01	-788
2017-07-01	-215
2017-10-01	-3597
2018-01-01	4734
2018-04-01	116