Quarter	Millions of US Dollars
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	0
1979-10-01	0
1980-01-01	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	16
1981-07-01	41
1981-10-01	41
1982-01-01	41
1982-04-01	55
1982-07-01	30
1982-10-01	30
1983-01-01	30
1983-04-01	67
1983-07-01	104
1983-10-01	103
1984-01-01	163
1984-04-01	90
1984-07-01	50
1984-10-01	99
1985-01-01	134
1985-04-01	207
1985-07-01	225
1985-10-01	219
1986-01-01	139
1986-04-01	151
1986-07-01	172
1986-10-01	141
1987-01-01	161
1987-04-01	58
1987-07-01	41
1987-10-01	92
1988-01-01	71
1988-04-01	94
1988-07-01	133
1988-10-01	196
1989-01-01	198
1989-04-01	165
1989-07-01	296
1989-10-01	179
1990-01-01	154
1990-04-01	160
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	36
1992-01-01	41
1992-04-01	136
1992-07-01	166
1992-10-01	802
1993-01-01	824
1993-04-01	1042
1993-07-01	2029
1993-10-01	1568
1994-01-01	2195
1994-04-01	2080
1994-07-01	2425
1994-10-01	2700
1995-01-01	2192
1995-04-01	2286
1995-07-01	2439
1995-10-01	3493
1996-01-01	3179
1996-04-01	3189
1996-07-01	3392
1996-10-01	4348
1997-01-01	4602
1997-04-01	4790
1997-07-01	4937
1997-10-01	11997
1998-01-01	12231
1998-04-01	12850
1998-07-01	12310
1998-10-01	5057
1999-01-01	4560
1999-04-01	6164
1999-07-01	7260
1999-10-01	8001
2000-01-01	10504
2000-04-01	30444
2000-07-01	30802
2000-10-01	30373
2001-01-01	29696
2001-04-01	4849
2001-07-01	5178
2001-10-01	3988
2002-01-01	4799
2002-04-01	5247
2002-07-01	4708
2002-10-01	5055
2003-01-01	5567
2003-04-01	8859
2003-07-01	10593
2003-10-01	11081
2004-01-01	9448
2004-04-01	47198
2004-07-01	45436
2004-10-01	46321
2005-01-01	44150
2005-04-01	1703
2005-07-01	1691
2005-10-01	1769
2006-01-01	3077
2006-04-01	3676
2006-07-01	4535
2006-10-01	4402
2007-01-01	4483
2007-04-01	4899
2007-07-01	4267
2007-10-01	11121
2008-01-01	9925
2008-04-01	9362
2008-07-01	11011
2008-10-01	4669
2009-01-01	4825
2009-04-01	4376
2009-07-01	2848
2009-10-01	3326
2010-01-01	2708
2010-04-01	2216
2010-07-01	2667
2010-10-01	1925
2011-01-01	3019
2011-04-01	3051
2011-07-01	2231
2011-10-01	1892
2012-01-01	862
2012-04-01	379
2012-07-01	204
2012-10-01	927
2013-01-01	920
2013-04-01	917
2013-07-01	1369
2013-10-01	1397
2014-01-01	1299
2014-04-01	2563
2014-07-01	2116
2014-10-01	2330
2015-01-01	2331
2015-04-01	1356
2015-07-01	2135
2015-10-01	1688
2016-01-01	3964
2016-04-01	21585
2016-07-01	21383
2016-10-01	20947
2017-01-01	18891
2017-04-01	3493
2017-07-01	3422
2017-10-01	4206
2018-01-01	4278
2018-04-01	5781