Quarter	Millions of US Dollars
1971-10-01	15
1972-04-01	32
1972-07-01	18
1974-10-01	24
1975-01-01	7
1975-07-01	40
1975-10-01	6
1976-07-01	32
1976-10-01	116
1977-04-01	47
1977-07-01	33
1977-10-01	121
1978-01-01	199
1978-04-01	176
1978-07-01	100
1978-10-01	181
1979-01-01	281
1979-04-01	100
1979-07-01	19
1979-10-01	165
1980-01-01	80
1980-04-01	68
1980-07-01	38
1981-04-01	236
1981-10-01	112
1982-01-01	55
1982-04-01	135
1982-07-01	178
1982-10-01	47
1983-01-01	129
1983-04-01	194
1983-07-01	121
1983-10-01	18
1984-01-01	32
1984-04-01	52
1984-07-01	122
1984-10-01	42
1985-01-01	63
1985-04-01	171
1985-07-01	54
1985-10-01	-241
1986-01-01	36
1986-04-01	98
1986-07-01	94
1986-10-01	-79
1987-01-01	459
1987-04-01	-28
1987-07-01	-240
1987-10-01	493
1988-01-01	-100
1988-04-01	508
1988-07-01	-333
1988-10-01	-54
1989-01-01	29
1989-04-01	-130
1989-07-01	-5
1989-10-01	-11
1990-04-01	-155
1990-07-01	179
1990-10-01	669
1991-01-01	1146
1991-04-01	-216
1991-07-01	676
1991-10-01	1740
1992-01-01	2029
1992-04-01	3780
1992-07-01	2277
1992-10-01	3487
1993-01-01	3852
1993-04-01	2031
1993-07-01	-220
1993-10-01	175
1994-01-01	1455
1994-04-01	2689
1994-07-01	3471
1994-10-01	225
1995-01-01	1385
1995-04-01	-113
1995-07-01	-228
1995-10-01	-805
1996-01-01	1414
1996-04-01	-551
1996-07-01	-273
1996-10-01	222
1997-01-01	-102
1997-04-01	-650
1997-07-01	-1000
1997-10-01	-3583
1998-01-01	-1350
1998-04-01	1080
1998-07-01	-170
1998-10-01	-1689
1999-01-01	-326
1999-07-01	-60
1999-10-01	-386
2000-01-01	-1753
2000-04-01	-141
2000-07-01	-883
2000-10-01	-1486
2001-01-01	-1265
2001-04-01	4116
2001-07-01	-407
2001-10-01	-457
2002-01-01	877
2002-04-01	-1354
2002-07-01	-619
2002-10-01	-142
2003-01-01	6650
2003-04-01	3541
2003-07-01	-690
2003-10-01	-1506
2004-01-01	1331
2004-04-01	-1102
2004-07-01	-2032
2004-10-01	-89
2005-01-01	-19
2005-04-01	-1122
2006-01-01	-1000
2006-04-01	-48
2006-07-01	-8183
2006-10-01	376
2007-01-01	-2112
2007-04-01	-702
2007-07-01	-6720
2007-10-01	-442
2008-04-01	-197
2008-07-01	-7512
2008-10-01	-303
2009-01-01	2325
2009-04-01	-4405
2009-07-01	100
2010-01-01	1643
2010-04-01	1000
2010-10-01	2000
2011-01-01	10723
2011-04-01	-2191
2011-07-01	800
2012-01-01	1127
2012-04-01	3032
2012-07-01	-2033
2013-01-01	411
2013-04-01	-1000
2013-07-01	387
2013-10-01	3000
2014-01-01	-342
2014-04-01	2651
2014-07-01	1417
2014-10-01	549
2015-01-01	-123
2015-04-01	2901
2015-07-01	-163
2015-10-01	-3497
2016-01-01	-5131
2016-04-01	4291
2016-07-01	-152
2016-10-01	-130
2017-01-01	-1192
2017-04-01	792
2017-07-01	2246
2017-10-01	-331
2018-01-01	-576
2018-04-01	-2981