Quarter	Millions of US Dollars
1974-07-01	54
1974-10-01	82
1975-01-01	249
1975-04-01	401
1975-07-01	98
1976-04-01	39
1976-07-01	50
1976-10-01	41
1977-01-01	225
1977-04-01	67
1977-07-01	165
1977-10-01	142
1978-01-01	127
1978-04-01	48
1978-07-01	91
1978-10-01	273
1979-01-01	144
1979-04-01	83
1979-07-01	102
1979-10-01	6
1980-01-01	-33
1980-04-01	75
1980-07-01	190
1980-10-01	32
1981-01-01	52
1981-04-01	49
1981-07-01	114
1981-10-01	-22
1982-01-01	21
1982-04-01	55
1982-07-01	-9
1982-10-01	48
1983-01-01	195
1983-04-01	41
1983-07-01	122
1984-01-01	98
1984-04-01	-4
1984-07-01	42
1984-10-01	-56
1985-01-01	87
1985-04-01	184
1985-07-01	208
1985-10-01	-303
1986-01-01	560
1986-04-01	471
1986-07-01	176
1986-10-01	230
1987-01-01	667
1987-04-01	403
1987-07-01	189
1987-10-01	596
1988-01-01	1702
1988-04-01	522
1988-07-01	352
1988-10-01	-8
1989-01-01	571
1989-04-01	443
1989-07-01	81
1989-10-01	24
1990-01-01	974
1990-04-01	182
1990-07-01	95
1990-10-01	-22
1991-01-01	938
1991-04-01	12
1991-07-01	-160
1991-10-01	486
1992-01-01	798
1992-04-01	777
1992-07-01	-94
1992-10-01	298
1993-01-01	1156
1993-04-01	640
1993-07-01	957
1993-10-01	438
1994-01-01	1896
1994-04-01	702
1994-07-01	47
1994-10-01	1243
1995-01-01	2698
1995-04-01	633
1995-07-01	-597
1995-10-01	248
1996-01-01	2513
1996-04-01	382
1996-07-01	-241
1996-10-01	-328
1997-01-01	738
1997-04-01	319
1997-07-01	254
1997-10-01	-660
1998-01-01	837
1998-04-01	554
1998-07-01	1038
1998-10-01	2164
1999-01-01	4667
1999-04-01	1741
1999-07-01	-2467
1999-10-01	-743
2000-01-01	3658
2000-04-01	-540
2000-07-01	-1248
2000-10-01	-2738
2001-01-01	4341
2001-04-01	-245
2001-07-01	-193
2001-10-01	-978
2002-01-01	6795
2002-04-01	117
2002-07-01	-45
2002-10-01	-895
2003-01-01	6433
2003-04-01	7398
2003-07-01	-899
2003-10-01	-1553
2004-01-01	4839
2004-04-01	2719
2004-07-01	563
2004-10-01	-4223
2005-01-01	7801
2005-04-01	7253
2005-07-01	-2063
2005-10-01	-4791
2006-01-01	5119
2006-04-01	7237
2006-07-01	-2258
2006-10-01	-3778
2007-01-01	10825
2007-04-01	7983
2007-07-01	9055
2007-10-01	-22635
2008-01-01	11492
2008-04-01	-1120
2008-07-01	-2356
2008-10-01	6054
2009-01-01	6754
2009-04-01	-1171
2009-07-01	-3482
2009-10-01	-1560
2010-01-01	5933
2010-04-01	-944
2010-07-01	-3529
2010-10-01	-1561
2011-01-01	9746
2011-04-01	-1513
2011-07-01	-1845
2011-10-01	-2736
2012-01-01	-3643
2012-04-01	863
2012-07-01	1458
2012-10-01	-1790
2013-01-01	1668
2013-04-01	-65
2013-07-01	10616
2013-10-01	-6361
2014-01-01	-1992
2014-04-01	5708
2014-07-01	-4135
2014-10-01	3733
2015-01-01	1603
2015-04-01	4856
2015-07-01	-5076
2015-10-01	-1902
2016-01-01	7241
2016-04-01	-2538
2016-07-01	-4666
2016-10-01	6400
2017-01-01	294
2017-04-01	3498
2017-07-01	2761
2017-10-01	-2605
2018-01-01	2275
2018-04-01	-1676