Quarter	Millions of US Dollars
1966-07-01	15
1967-01-01	14
1972-04-01	32
1972-07-01	21
1972-10-01	55
1973-01-01	37
1973-04-01	51
1973-07-01	36
1973-10-01	60
1974-01-01	52
1974-04-01	49
1974-07-01	167
1974-10-01	296
1975-01-01	398
1975-04-01	493
1975-07-01	139
1975-10-01	38
1976-01-01	75
1976-04-01	104
1976-07-01	145
1976-10-01	327
1977-01-01	342
1977-04-01	325
1977-07-01	381
1977-10-01	280
1978-01-01	267
1978-04-01	360
1978-07-01	342
1978-10-01	312
1979-01-01	306
1979-04-01	265
1979-07-01	289
1979-10-01	77
1980-01-01	230
1980-04-01	369
1980-07-01	489
1980-10-01	307
1981-01-01	297
1981-04-01	352
1981-07-01	200
1981-10-01	413
1982-01-01	465
1982-04-01	260
1982-07-01	202
1982-10-01	69
1983-01-01	288
1983-04-01	362
1983-07-01	195
1983-10-01	44
1984-01-01	555
1984-04-01	409
1984-07-01	354
1984-10-01	227
1985-01-01	238
1985-04-01	409
1985-07-01	414
1985-10-01	-155
1986-01-01	721
1986-04-01	935
1986-07-01	590
1986-10-01	218
1987-01-01	1046
1987-04-01	553
1987-07-01	-27
1987-10-01	770
1988-01-01	2215
1988-04-01	758
1988-07-01	462
1988-10-01	378
1989-01-01	1378
1989-04-01	504
1989-07-01	1
1989-10-01	868
1990-01-01	1081
1990-04-01	780
1990-07-01	212
1990-10-01	603
1991-01-01	1415
1991-04-01	-211
1991-07-01	582
1991-10-01	984
1992-01-01	982
1992-04-01	1216
1992-07-01	508
1992-10-01	121
1993-01-01	928
1993-04-01	1266
1993-07-01	1871
1993-10-01	1373
1994-01-01	1778
1994-04-01	657
1994-07-01	434
1994-10-01	2098
1995-01-01	4003
1995-04-01	254
1995-07-01	571
1995-10-01	1592
1996-01-01	3823
1996-04-01	1348
1996-07-01	314
1996-10-01	696
1997-01-01	2959
1997-04-01	676
1997-07-01	1941
1997-10-01	76
1998-01-01	2392
1998-04-01	1998
1998-07-01	678
1998-10-01	2725
1999-01-01	4803
1999-04-01	4351
1999-07-01	718
1999-10-01	1387
2000-01-01	7190
2000-04-01	4020
2000-07-01	5245
2000-10-01	-1987
2001-01-01	9562
2001-04-01	-109
2001-07-01	426
2001-10-01	7885
2002-01-01	9404
2002-04-01	4725
2002-07-01	-562
2002-10-01	-579
2003-01-01	7159
2003-04-01	9236
2003-07-01	2797
2003-10-01	2212
2004-01-01	12536
2004-04-01	4907
2004-07-01	3956
2004-10-01	-19
2005-01-01	16343
2005-04-01	13546
2005-07-01	-1920
2005-10-01	4769
2006-01-01	13245
2006-04-01	14184
2006-07-01	728
2006-10-01	8356
2007-01-01	32896
2007-04-01	13294
2007-07-01	10058
2007-10-01	-11409
2008-01-01	15438
2008-04-01	-423
2008-07-01	1282
2008-10-01	12971
2009-01-01	11487
2009-04-01	406
2009-07-01	2618
2009-10-01	-7616
2010-01-01	3137
2010-04-01	-5700
2010-07-01	-818
2010-10-01	-6535
2011-01-01	11893
2011-04-01	-9783
2011-07-01	2376
2011-10-01	-10072
2012-01-01	-10880
2012-04-01	-3455
2012-07-01	-1086
2012-10-01	46
2013-01-01	-3837
2013-04-01	2720
2013-07-01	4569
2013-10-01	-2178
2014-01-01	-16551
2014-04-01	3084
2014-07-01	-6880
2014-10-01	2318
2015-01-01	-2352
2015-04-01	-156
2015-07-01	-2504
2015-10-01	-4649
2016-01-01	3936
2016-04-01	-6393
2016-07-01	-6890
2016-10-01	2003
2017-01-01	1434
2017-04-01	856
2017-07-01	1678
2017-10-01	-4037
2018-01-01	6642
2018-04-01	-1427