Quarter	Millions of US Dollars
1971-01-01	61
1971-04-01	51
1971-10-01	20
1972-01-01	97
1972-07-01	51
1972-10-01	79
1973-01-01	65
1973-04-01	114
1973-10-01	71
1974-01-01	15
1974-07-01	35
1975-01-01	39
1975-04-01	209
1975-07-01	93
1975-10-01	56
1976-01-01	39
1976-04-01	59
1976-07-01	8
1976-10-01	72
1977-01-01	28
1977-04-01	15
1977-07-01	39
1977-10-01	121
1978-01-01	98
1978-04-01	202
1978-07-01	139
1978-10-01	70
1979-01-01	98
1979-04-01	-18
1979-07-01	67
1979-10-01	-25
1980-01-01	-40
1980-04-01	-109
1980-07-01	1
1980-10-01	-65
1981-01-01	33
1981-10-01	-18
1982-01-01	19
1982-04-01	74
1982-07-01	-100
1982-10-01	115
1983-01-01	176
1983-04-01	105
1983-07-01	-33
1983-10-01	-56
1984-01-01	14
1984-04-01	72
1984-07-01	53
1984-10-01	1
1985-01-01	62
1985-04-01	301
1985-07-01	53
1985-10-01	-458
1986-01-01	-110
1986-04-01	-20
1986-07-01	65
1986-10-01	-89
1987-01-01	-121
1987-04-01	-14
1987-07-01	-51
1987-10-01	-132
1988-01-01	-135
1988-04-01	-159
1988-07-01	-71
1988-10-01	-26
1989-01-01	-50
1989-04-01	-133
1989-07-01	-18
1989-10-01	-12
1990-01-01	-48
1990-04-01	-477
1990-07-01	-212
1990-10-01	-75
1991-01-01	-128
1991-04-01	-29
1991-07-01	-141
1992-01-01	-34
1992-04-01	145
1992-07-01	-68
1992-10-01	-115
1993-04-01	-216
1993-07-01	3
1993-10-01	0
1994-01-01	0
1994-07-01	0
1995-01-01	-1
1995-07-01	22
1995-10-01	385
1996-01-01	0
1996-04-01	140
1996-07-01	-80
1996-10-01	1800
1997-01-01	22
1997-04-01	-136
1997-07-01	413
1997-10-01	427
1998-01-01	367
1998-04-01	466
1998-07-01	391
1998-10-01	7
1999-01-01	752
1999-04-01	7
1999-07-01	106
1999-10-01	473
2000-01-01	304
2000-04-01	614
2000-07-01	410
2000-10-01	-79
2001-01-01	-11
2001-04-01	317
2001-07-01	121
2001-10-01	2
2002-01-01	10
2002-04-01	-12
2002-07-01	-284
2002-10-01	-102
2003-01-01	17
2003-04-01	34
2003-07-01	4
2003-10-01	5
2004-01-01	1332
2004-04-01	189
2004-07-01	-116
2004-10-01	131
2005-01-01	-64
2005-04-01	-536
2005-07-01	2652
2005-10-01	-232
2006-01-01	2411
2006-04-01	1182
2006-07-01	2370
2006-10-01	3398
2007-01-01	-93
2007-04-01	5299
2007-07-01	3279
2007-10-01	2915
2008-01-01	1909
2008-04-01	3854
2008-07-01	1108
2008-10-01	6
2009-01-01	-131
2009-04-01	536
2009-07-01	7691
2009-10-01	-218
2010-01-01	-85
2010-04-01	1509
2010-07-01	1044
2010-10-01	2398
2011-01-01	3754
2011-04-01	-1264
2011-07-01	-279
2011-10-01	6513
2012-01-01	2925
2012-04-01	495
2012-07-01	1121
2012-10-01	1786
2013-01-01	-555
2013-04-01	-1369
2013-07-01	186
2013-10-01	-1253
2014-01-01	797
2014-04-01	6796
2014-07-01	-3966
2014-10-01	4728
2015-01-01	2224
2015-04-01	2285
2015-07-01	-3
2015-10-01	3934
2016-01-01	-19
2016-04-01	-1128
2016-07-01	-330
2016-10-01	-1303
2017-01-01	-1010
2017-04-01	148
2017-07-01	435
2017-10-01	3834
2018-01-01	-1718
2018-04-01	1155