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	319
1986-01-01	339
1986-04-01	351
1986-07-01	372
1986-10-01	241
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	218
1988-10-01	281
1989-01-01	283
1989-04-01	250
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	106
1992-04-01	201
1992-07-01	231
1992-10-01	892
1993-01-01	849
1993-04-01	1027
1993-07-01	2204
1993-10-01	1676
1994-01-01	2284
1994-04-01	2263
1994-07-01	2792
1994-10-01	3234
1995-01-01	2423
1995-04-01	2343
1995-07-01	2620
1995-10-01	3765
1996-01-01	3023
1996-04-01	3115
1996-07-01	2909
1996-10-01	4544
1997-01-01	4937
1997-04-01	4975
1997-07-01	4526
1997-10-01	11623
1998-01-01	11562
1998-04-01	12058
1998-07-01	12150
1998-10-01	4664
1999-01-01	4220
1999-04-01	5821
1999-07-01	6845
1999-10-01	7392
2000-01-01	9971
2000-04-01	29233
2000-07-01	29700
2000-10-01	29484
2001-01-01	28751
2001-04-01	4479
2001-07-01	5116
2001-10-01	3608
2002-01-01	4525
2002-04-01	4543
2002-07-01	3558
2002-10-01	3794
2003-01-01	4557
2003-04-01	8386
2003-07-01	10201
2003-10-01	11051
2004-01-01	9273
2004-04-01	47009
2004-07-01	45545
2004-10-01	46475
2005-01-01	44386
2005-04-01	1628
2005-07-01	1489
2005-10-01	1561
2006-01-01	2552
2006-04-01	3074
2006-07-01	3981
2006-10-01	3841
2007-01-01	4305
2007-04-01	4978
2007-07-01	4347
2007-10-01	10726
2008-01-01	9535
2008-04-01	8687
2008-07-01	8079
2008-10-01	2097
2009-01-01	2253
2009-04-01	1958
2009-07-01	2641
2009-10-01	3208
2010-01-01	2517
2010-04-01	2282
2010-07-01	2733
2010-10-01	1706
2011-01-01	2615
2011-04-01	2506
2011-07-01	1686
2011-10-01	1620
2012-01-01	750
2012-04-01	267
2012-07-01	92
2012-10-01	936
2013-01-01	1029
2013-04-01	1026
2013-07-01	1091
2013-10-01	1190
2014-01-01	1101
2014-04-01	2366
2014-07-01	2333
2014-10-01	2366
2015-01-01	2359
2015-04-01	1384
2015-07-01	1649
2015-10-01	1080
2016-01-01	3453
2016-04-01	20825
2016-07-01	21070
2016-10-01	21057
2017-01-01	18904
2017-04-01	3776
2017-07-01	3705
2017-10-01	4189
2018-01-01	4278
2018-04-01	5781