Quarter	Millions of US Dollars
1975-04-01	43
1976-10-01	50
1978-01-01	25
1978-04-01	100
1978-10-01	36
1980-10-01	25
1981-10-01	150
1982-01-01	39
1982-04-01	-42
1982-10-01	248
1983-01-01	8
1984-04-01	11
1984-10-01	102
1985-01-01	34
1985-04-01	100
1985-10-01	-110
1986-01-01	155
1986-04-01	20
1986-07-01	-74
1986-10-01	-374
1987-01-01	1
1987-04-01	1
1987-07-01	1
1987-10-01	79
1988-01-01	-61
1988-04-01	1
1988-07-01	1
1988-10-01	64
1989-01-01	1
1989-04-01	1
1989-07-01	201
1989-10-01	1
1990-01-01	1
1990-04-01	1
1990-07-01	2
1990-10-01	2
1991-01-01	2
1991-04-01	2
1991-07-01	2
1991-10-01	-35
1992-01-01	14
1992-04-01	-166
1992-07-01	2
1992-10-01	-73
1993-01-01	-98
1993-04-01	-52
1993-07-01	43
1993-10-01	-62
1994-01-01	17
1994-04-01	-42
1994-07-01	202
1994-10-01	-56
1995-01-01	-54
1995-04-01	475
1995-07-01	-7
1995-10-01	122
1996-01-01	177
1996-04-01	-13
1996-07-01	-238
1996-10-01	-134
1997-01-01	501
1997-04-01	55
1997-07-01	46
1997-10-01	-143
1998-01-01	298
1998-04-01	-75
1999-01-01	145
1999-04-01	-35
1999-07-01	-30
1999-10-01	-19
2000-01-01	-10
2000-04-01	-17
2000-07-01	489
2000-10-01	-270
2001-01-01	-289
2001-04-01	388
2001-07-01	-41
2001-10-01	-99
2002-01-01	146
2002-04-01	326
2002-07-01	0
2002-10-01	-187
2003-01-01	-102
2003-04-01	-41
2003-10-01	76
2004-01-01	20
2004-04-01	-40
2004-07-01	-60
2004-10-01	220
2005-01-01	-97
2005-04-01	-27
2005-07-01	109
2005-10-01	-51
2006-01-01	-325
2006-04-01	508
2006-07-01	8
2006-10-01	66
2007-01-01	76
2007-04-01	-380
2007-07-01	-351
2007-10-01	1362
2008-01-01	-75
2008-04-01	-358
2008-07-01	-635
2008-10-01	131
2009-01-01	-142
2009-04-01	1
2009-07-01	-59
2009-10-01	150
2010-01-01	0
2010-04-01	618
2010-07-01	232
2010-10-01	3395
2011-01-01	2331
2011-04-01	-262
2011-07-01	2696
2011-10-01	1098
2012-01-01	1425
2012-04-01	126
2012-07-01	1630
2012-10-01	145
2013-01-01	-34
2013-04-01	112
2013-07-01	212
2013-10-01	-166
2014-01-01	-3936
2014-04-01	298
2014-07-01	351
2014-10-01	176
2015-01-01	78
2015-04-01	55
2015-07-01	330
2015-10-01	-16
2016-01-01	-76
2016-04-01	3140
2016-07-01	-2209
2016-10-01	-2833
2017-01-01	-1225
2017-10-01	616
2018-01-01	195