Quarter	Millions of US Dollars
1972-04-01	25
1973-04-01	17
1977-07-01	43
1978-04-01	68
1978-10-01	52
1979-01-01	73
1979-07-01	50
1980-04-01	-25
1982-01-01	314
1982-10-01	300
1983-01-01	62
1983-04-01	212
1983-07-01	850
1983-10-01	65
1984-01-01	350
1984-04-01	6
1984-07-01	153
1984-10-01	600
1985-04-01	846
1985-07-01	12
1985-10-01	1060
1986-10-01	44
1987-04-01	82
1987-07-01	84
1987-10-01	-37
1988-01-01	233
1988-04-01	-328
1988-07-01	66
1988-10-01	-2
1989-01-01	124
1989-04-01	-220
1989-07-01	-105
1989-10-01	153
1990-04-01	-3
1990-07-01	200
1990-10-01	-152
1991-04-01	190
1992-01-01	-117
1992-04-01	-50
1992-10-01	-1074
1993-07-01	-1200
1993-10-01	-217
1994-04-01	-643
1994-07-01	-410
1994-10-01	-600
1995-04-01	-498
1996-10-01	-200
1997-04-01	-86
1997-07-01	-81
1998-01-01	-468
1998-07-01	-68
1999-04-01	1000
2000-07-01	300
2000-10-01	561
2001-07-01	1000
2002-01-01	750
2003-10-01	-650
2005-10-01	-772
2009-04-01	-1500
2009-07-01	-120
2010-04-01	1250
2011-04-01	800
2011-07-01	250
2013-10-01	482
2015-04-01	250
2016-04-01	1500
2016-07-01	-1200