Quarter	Millions of US Dollars
1966-07-01	15
1967-01-01	14
1972-04-01	21
1972-07-01	21
1972-10-01	55
1973-01-01	27
1973-04-01	36
1973-07-01	26
1973-10-01	44
1974-01-01	38
1974-04-01	29
1974-07-01	47
1974-10-01	136
1975-01-01	116
1975-04-01	92
1975-07-01	37
1975-10-01	19
1976-01-01	55
1976-07-01	32
1976-10-01	117
1977-01-01	38
1977-04-01	82
1977-07-01	22
1977-10-01	49
1978-01-01	105
1978-04-01	176
1978-07-01	32
1978-10-01	8
1979-01-01	-12
1979-04-01	44
1979-07-01	-14
1979-10-01	-112
1980-01-01	28
1980-04-01	91
1980-07-01	72
1980-10-01	96
1981-01-01	103
1981-04-01	132
1981-07-01	-44
1981-10-01	-19
1982-01-01	59
1982-04-01	113
1982-07-01	92
1982-10-01	77
1983-01-01	-13
1983-04-01	23
1983-07-01	75
1983-10-01	-123
1984-01-01	-9
1984-04-01	45
1984-07-01	41
1984-10-01	-1
1985-01-01	-26
1985-04-01	-8
1985-10-01	-99
1986-01-01	-61
1986-04-01	125
1986-07-01	40
1986-10-01	13
1987-01-01	-7
1987-04-01	-185
1987-07-01	-202
1987-10-01	102
1988-01-01	-104
1988-04-01	-328
1988-07-01	2
1988-10-01	-36
1989-01-01	-7
1989-04-01	-43
1989-07-01	-110
1989-10-01	-54
1990-01-01	-56
1990-04-01	-19
1990-07-01	6
1990-10-01	-39
1991-01-01	104
1991-04-01	26
1991-07-01	-7
1991-10-01	58
1992-01-01	-62
1992-04-01	-18
1992-07-01	-81
1992-10-01	-125
1993-01-01	-26
1993-04-01	-8
1993-07-01	-18
1993-10-01	161
1994-01-01	246
1994-04-01	-130
1994-07-01	18
1994-10-01	198
1995-01-01	-14
1995-04-01	213
1995-07-01	-59
1995-10-01	-357
1996-01-01	-25
1996-04-01	-3
1996-07-01	-108
1997-01-01	-49
1997-04-01	-61
1997-07-01	-67
1997-10-01	-58
1998-01-01	0
1998-04-01	115
1998-07-01	29
1998-10-01	283
1999-01-01	102
1999-07-01	73
2000-01-01	413
2000-04-01	-24
2000-07-01	-29
2000-10-01	-4
2001-01-01	-24
2001-04-01	-48
2001-10-01	187
2002-01-01	-10
2002-04-01	225
2002-10-01	-54
2003-04-01	106
2003-07-01	388
2003-10-01	2533
2004-01-01	413
2004-04-01	217
2004-07-01	61
2004-10-01	1154
2005-01-01	1832
2005-04-01	872
2005-07-01	-299
2005-10-01	2947
2006-01-01	316
2006-04-01	331
2006-07-01	42
2006-10-01	1261
2007-01-01	1301
2007-04-01	1753
2007-07-01	103
2007-10-01	4908
2008-04-01	-430
2008-07-01	-258
2008-10-01	3089
2009-01-01	298
2009-04-01	740
2009-07-01	3264
2009-10-01	31
2010-01-01	-426
2010-04-01	2254
2010-07-01	1303
2010-10-01	558
2011-01-01	820
2011-04-01	1112
2011-07-01	1695
2011-10-01	1011
2012-01-01	419
2012-04-01	1819
2012-07-01	1820
2012-10-01	-150
2013-01-01	1497
2013-04-01	1277
2013-07-01	2608
2013-10-01	592
2014-01-01	-2796
2014-04-01	343
2014-07-01	-562
2014-10-01	1767
2015-01-01	-225
2015-04-01	-110
2015-07-01	1445
2015-10-01	-848
2016-01-01	-36
2016-04-01	-334
2016-07-01	500
2016-10-01	-1112
2017-01-01	-7
2017-04-01	-248
2017-07-01	1317
2017-10-01	811
2018-01-01	-186
2018-04-01	411