Quarter	Millions of US Dollars
1974-10-01	19
1976-04-01	10
1976-07-01	24
1976-10-01	40
1977-01-01	25
1977-10-01	46
1978-01-01	42
1978-04-01	14
1979-01-01	44
1979-07-01	-25
1980-10-01	47
1981-07-01	103
1981-10-01	-41
1982-01-01	16
1983-04-01	6
1983-07-01	70
1983-10-01	72
1984-01-01	44
1984-04-01	115
1984-07-01	190
1984-10-01	362
1985-01-01	100
1985-04-01	477
1985-07-01	343
1985-10-01	444
1986-01-01	409
1986-04-01	204
1986-07-01	20
1986-10-01	125
1987-01-01	-25
1987-04-01	26
1987-07-01	205
1987-10-01	50
1988-01-01	-428
1988-04-01	-95
1988-07-01	50
1988-10-01	60
1989-01-01	-110
1989-04-01	-95
1989-07-01	-36
1989-10-01	126
1990-01-01	248
1990-04-01	-224
1990-07-01	58
1990-10-01	-133
1991-01-01	656
1991-04-01	1287
1991-07-01	250
1991-10-01	512
1992-01-01	731
1992-04-01	244
1992-07-01	962
1992-10-01	801
1993-01-01	569
1993-04-01	717
1993-07-01	651
1993-10-01	2406
1994-01-01	710
1994-04-01	1338
1994-07-01	1327
1994-10-01	357
1995-01-01	1580
1995-04-01	2662
1995-07-01	2237
1995-10-01	1769
1996-01-01	2337
1996-04-01	3554
1996-07-01	5646
1996-10-01	5263
1997-01-01	2340
1997-04-01	2308
1997-07-01	4246
1997-10-01	294
1998-01-01	-869
1998-04-01	3454
1998-07-01	-1484
1998-10-01	-1116
1999-01-01	-691
1999-04-01	-1471
1999-07-01	-1751
1999-10-01	410
2000-01-01	1735
2000-04-01	-601
2000-07-01	-436
2000-10-01	-129
2001-01-01	-1362
2001-04-01	-147
2001-07-01	-2054
2001-10-01	1949
2002-01-01	-1556
2002-04-01	1513
2002-07-01	1225
2002-10-01	809
2003-01-01	948
2003-04-01	2481
2003-07-01	2534
2003-10-01	-121
2004-01-01	4185
2004-04-01	3161
2004-07-01	1241
2004-10-01	2173
2005-01-01	2558
2005-04-01	1324
2005-07-01	2623
2005-10-01	4104
2006-01-01	2292
2006-04-01	4097
2006-07-01	4671
2006-10-01	3458
2007-01-01	928
2007-04-01	9797
2007-07-01	1011
2007-10-01	1538
2008-01-01	1681
2008-04-01	3308
2008-07-01	-1580
2008-10-01	-6392
2009-01-01	3657
2009-04-01	10961
2009-07-01	5946
2009-10-01	-1462
2010-01-01	1189
2010-04-01	727
2010-07-01	4154
2010-10-01	1753
2011-01-01	5741
2011-04-01	3242
2011-07-01	5035
2011-10-01	4333
2012-01-01	6181
2012-04-01	1252
2012-07-01	8345
2012-10-01	-3444
2013-01-01	3591
2013-04-01	-5243
2013-07-01	11896
2013-10-01	9463
2014-01-01	2955
2014-04-01	-1211
2014-07-01	-1403
2014-10-01	6567
2015-01-01	-1234
2015-04-01	3978
2015-07-01	-495
2015-10-01	-4062
2016-01-01	-215
2016-04-01	-2980
2016-07-01	972
2016-10-01	-2119
2017-01-01	2925
2017-04-01	1382
2017-07-01	2655
2017-10-01	3524
2018-01-01	5445
2018-04-01	4020