Quarter	Millions of US Dollars
1975-10-01	18
1978-07-01	104
1979-01-01	37
1979-07-01	25
1980-07-01	46
1981-04-01	46
1981-10-01	25
1982-04-01	200
1982-07-01	37
1982-10-01	75
1983-01-01	36
1983-07-01	292
1984-07-01	-34
1985-07-01	-32
1985-10-01	-44
1986-01-01	300
1986-10-01	-25
1987-10-01	-18
1988-07-01	-75
1988-10-01	161
1989-01-01	-36
1989-07-01	-134
1990-07-01	280
1990-10-01	235
1991-04-01	263
1991-07-01	-7
1991-10-01	33
1992-01-01	76
1992-04-01	-178
1992-07-01	214
1992-10-01	206
1993-01-01	-24
1993-07-01	6
1993-10-01	25
1994-01-01	84
1994-04-01	1081
1994-07-01	324
1994-10-01	75
1995-01-01	-530
1995-07-01	125
1995-10-01	334
1996-01-01	155
1996-04-01	213
1996-07-01	650
1996-10-01	974
1997-01-01	925
1997-04-01	332
1997-07-01	-209
1997-10-01	-66
1998-01-01	-759
1998-04-01	419
1998-07-01	-104
1998-10-01	-327
1999-01-01	-71
1999-04-01	-3
1999-07-01	-1714
1999-10-01	-400
2000-01-01	728
2000-04-01	-785
2000-07-01	-30
2000-10-01	-539
2001-01-01	-363
2001-04-01	-376
2001-07-01	-165
2002-01-01	-76
2002-04-01	134
2002-07-01	-170
2002-10-01	150
2003-01-01	5
2003-04-01	387
2003-07-01	342
2004-01-01	1305
2004-04-01	25
2004-10-01	38
2005-01-01	200
2005-04-01	980
2005-07-01	99
2005-10-01	1280
2006-01-01	2000
2006-04-01	-242
2006-07-01	-400
2006-10-01	67
2007-01-01	1350
2007-04-01	875
2007-10-01	-22
2008-01-01	2000
2008-04-01	1600
2008-07-01	-47
2008-10-01	-301
2009-01-01	4700
2009-04-01	550
2009-07-01	934
2009-10-01	1290
2010-01-01	2860
2010-04-01	250
2010-07-01	-217
2010-10-01	444
2011-01-01	-435
2011-04-01	4115
2011-10-01	2840
2012-01-01	4105
2012-04-01	5375
2012-07-01	-83
2012-10-01	2429
2013-01-01	1225
2013-04-01	5130
2013-07-01	2550
2013-10-01	150
2014-01-01	2730
2014-04-01	800
2014-07-01	3861
2014-10-01	-12
2015-01-01	6336
2015-04-01	6897
2015-07-01	3432
2015-10-01	3683
2016-01-01	1559
2016-04-01	9156
2016-07-01	-1347
2016-10-01	3359
2017-01-01	2019
2017-04-01	4872
2017-07-01	7217
2017-10-01	3631
2018-01-01	1556
2018-04-01	6617