Quarter	Millions of US Dollars
1971-10-01	15
1972-01-01	20
1972-04-01	52
1972-10-01	20
1973-07-01	77
1973-10-01	30
1974-01-01	50
1974-07-01	9
1975-01-01	24
1975-04-01	12
1975-10-01	19
1976-04-01	25
1976-07-01	60
1976-10-01	85
1977-01-01	62
1977-04-01	109
1977-07-01	77
1977-10-01	62
1978-01-01	116
1978-07-01	22
1978-10-01	42
1979-01-01	106
1980-04-01	-20
1980-07-01	25
1981-01-01	75
1981-07-01	-30
1981-10-01	30
1982-01-01	-14
1982-04-01	-4
1982-07-01	57
1982-10-01	20
1983-01-01	-76
1983-04-01	-25
1983-07-01	38
1983-10-01	108
1984-01-01	80
1984-07-01	-28
1984-10-01	75
1985-01-01	59
1985-04-01	107
1985-07-01	-50
1985-10-01	10
1986-01-01	-106
1986-04-01	-36
1986-07-01	120
1986-10-01	169
1987-01-01	47
1987-04-01	374
1987-07-01	-26
1987-10-01	73
1988-01-01	64
1988-04-01	46
1988-07-01	-78
1988-10-01	3
1989-01-01	-25
1989-04-01	128
1989-07-01	-68
1989-10-01	-250
1990-01-01	34
1990-04-01	70
1990-07-01	-24
1991-01-01	-32
1991-04-01	381
1991-07-01	174
1991-10-01	-85
1992-01-01	39
1992-04-01	-119
1992-07-01	-7
1992-10-01	-73
1993-01-01	-40
1993-04-01	159
1993-07-01	2524
1993-10-01	2975
1994-01-01	2635
1994-04-01	1081
1994-07-01	1615
1994-10-01	2379
1995-01-01	-1339
1995-04-01	-337
1995-07-01	1071
1995-10-01	1342
1996-01-01	2595
1996-04-01	343
1996-07-01	5008
1996-10-01	3371
1997-01-01	3724
1997-04-01	4420
1997-07-01	5781
1997-10-01	175
1998-01-01	874
1998-04-01	5164
1998-07-01	2238
1998-10-01	-572
1999-01-01	7852
1999-04-01	747
1999-07-01	1957
1999-10-01	3102
2000-01-01	1642
2000-04-01	5694
2000-07-01	6308
2000-10-01	3106
2001-01-01	9085
2001-04-01	8187
2001-07-01	4661
2001-10-01	5858
2002-01-01	3403
2002-04-01	474
2002-07-01	-326
2002-10-01	5243
2003-01-01	2004
2003-04-01	2543
2003-07-01	2542
2003-10-01	8730
2004-01-01	-293
2004-04-01	5001
2004-07-01	3853
2004-10-01	9793
2005-01-01	2915
2005-04-01	9293
2005-07-01	7299
2005-10-01	6253
2006-01-01	3970
2006-04-01	10594
2006-07-01	6477
2006-10-01	5938
2007-01-01	7127
2007-04-01	13860
2007-07-01	2138
2007-10-01	1970
2008-01-01	3746
2008-04-01	4062
2008-07-01	3432
2008-10-01	-4578
2009-01-01	-10084
2009-04-01	10306
2009-07-01	6925
2009-10-01	6073
2010-01-01	6801
2010-04-01	-3056
2010-07-01	6036
2010-10-01	1951
2011-01-01	-8256
2011-04-01	5414
2011-07-01	2048
2011-10-01	5924
2012-01-01	17464
2012-04-01	8719
2012-07-01	13669
2012-10-01	21396
2013-01-01	9723
2013-04-01	7338
2013-07-01	4958
2013-10-01	996
2014-01-01	4999
2014-04-01	1565
2014-07-01	11092
2014-10-01	-893
2015-01-01	8800
2015-04-01	3097
2015-07-01	-8958
2015-10-01	2191
2016-01-01	4697
2016-04-01	4132
2016-07-01	-4234
2016-10-01	5632
2017-01-01	5860
2017-04-01	5218
2017-07-01	25285
2017-10-01	390
2018-01-01	9950
2018-04-01	31744