Quarter	Millions of US Dollars
1978-01-01	25
1978-04-01	44
1979-01-01	30
1979-04-01	80
1979-07-01	66
1980-04-01	46
1981-07-01	43
1982-01-01	42
1983-01-01	-4
1983-07-01	100
1984-01-01	104
1984-04-01	-80
1984-07-01	42
1985-01-01	400
1985-04-01	40
1985-07-01	21
1985-10-01	295
1986-04-01	-59
1986-07-01	-58
1988-04-01	-80
1988-07-01	248
1989-04-01	-72
1989-07-01	200
1990-01-01	-145
1990-04-01	-300
1990-07-01	-69
1991-01-01	-83
1991-07-01	-170
1991-10-01	-77
1992-01-01	300
1993-01-01	136
1993-04-01	216
1993-07-01	126
1993-10-01	1114
1994-01-01	575
1994-04-01	128
1994-07-01	219
1994-10-01	246
1995-01-01	90
1995-04-01	268
1995-07-01	555
1995-10-01	480
1996-01-01	1008
1996-04-01	990
1996-07-01	1384
1996-10-01	925
1997-01-01	683
1997-04-01	1166
1997-07-01	596
1997-10-01	-27
1998-01-01	-143
1998-04-01	70
1998-07-01	-127
1998-10-01	72
1999-01-01	-245
1999-04-01	126
1999-07-01	-635
1999-10-01	-19
2000-01-01	-191
2000-04-01	225
2000-07-01	-533
2000-10-01	-78
2001-01-01	-288
2001-04-01	-47
2001-07-01	-780
2001-10-01	-585
2002-01-01	-491
2002-04-01	-345
2002-07-01	938
2002-10-01	-258
2003-01-01	-28
2003-04-01	-154
2003-07-01	-553
2003-10-01	-460
2004-01-01	-918
2004-04-01	588
2004-07-01	658
2004-10-01	230
2005-01-01	204
2005-04-01	1445
2005-07-01	-493
2005-10-01	181
2006-01-01	-102
2006-04-01	473
2006-07-01	497
2006-10-01	-580
2007-01-01	-662
2007-04-01	-1059
2007-07-01	-50
2007-10-01	-323
2008-01-01	0
2008-04-01	-80
2008-07-01	-30
2008-10-01	-424
2009-01-01	-167
2009-07-01	-268
2009-10-01	-134
2010-01-01	-250
2010-04-01	-336
2010-10-01	-120
2011-01-01	328
2011-04-01	-450
2011-07-01	-410
2012-01-01	0
2012-04-01	0
2012-07-01	528
2012-10-01	1828
2013-01-01	516
2013-04-01	-71
2013-07-01	500
2013-10-01	-265
2014-01-01	290
2014-04-01	1000
2014-07-01	-313
2014-10-01	-100
2015-01-01	61
2015-04-01	-653
2015-07-01	115
2015-10-01	-56
2016-01-01	-100
2016-04-01	300
2016-07-01	1024
2016-10-01	100
2017-01-01	-109
2017-04-01	535
2017-07-01	4153
2017-10-01	-2321
2018-01-01	-200
2018-04-01	1347