Quarter	Millions of US Dollars
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	0
1981-07-01	15
1981-10-01	15
1982-01-01	43
1982-04-01	43
1982-07-01	27
1982-10-01	29
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	17
1984-10-01	16
1985-01-01	16
1985-04-01	16
1985-07-01	0
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	17
1986-10-01	17
1987-01-01	17
1987-04-01	17
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	27
1988-07-01	27
1988-10-01	28
1989-01-01	26
1989-04-01	76
1989-07-01	118
1989-10-01	269
1990-01-01	265
1990-04-01	190
1990-07-01	175
1990-10-01	25
1991-01-01	25
1991-04-01	25
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	200
1992-10-01	200
1993-01-01	200
1993-04-01	0
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	123
1994-07-01	0
1994-10-01	448
1995-01-01	608
1995-04-01	704
1995-07-01	704
1995-10-01	312
1996-01-01	170
1996-04-01	270
1996-07-01	336
1996-10-01	466
1997-01-01	690
1997-04-01	1922
1997-07-01	1922
1997-10-01	2402
1998-01-01	2640
1998-04-01	2096
1998-07-01	2675
1998-10-01	3383
1999-01-01	3666
1999-04-01	4264
1999-07-01	4794
1999-10-01	3385
2000-01-01	2395
2000-04-01	1976
2000-07-01	2366
2000-10-01	5195
2001-01-01	5562
2001-04-01	4427
2001-07-01	2204
2001-10-01	1560
2002-01-01	1460
2002-04-01	1751
2002-07-01	2096
2002-10-01	2394
2003-01-01	2482
2003-04-01	3081
2003-07-01	3068
2003-10-01	2664
2004-01-01	2393
2004-04-01	2409
2004-07-01	2874
2004-10-01	2468
2005-01-01	3100
2005-04-01	2813
2005-07-01	3134
2005-10-01	3500
2006-01-01	2703
2006-04-01	2489
2006-07-01	2076
2006-10-01	1234
2007-01-01	1601
2007-04-01	1359
2007-07-01	1245
2007-10-01	2043
2008-01-01	2858
2008-04-01	2928
2008-07-01	2273
2008-10-01	2173
2009-01-01	1370
2009-04-01	1695
2009-07-01	1745
2009-10-01	1303
2010-01-01	1606
2010-04-01	2211
2010-07-01	2230
2010-10-01	2472
2011-01-01	3557
2011-04-01	2938
2011-07-01	2717
2011-10-01	2759
2012-01-01	1695
2012-04-01	4473
2012-07-01	5392
2012-10-01	5386
2013-01-01	5744
2013-04-01	3724
2013-07-01	3112
2013-10-01	2379
2014-01-01	2799
2014-04-01	1943
2014-07-01	2991
2014-10-01	5709
2015-01-01	5981
2015-04-01	6145
2015-07-01	5604
2015-10-01	3426
2016-01-01	1645
2016-04-01	1436
2016-07-01	2776
2016-10-01	5966
2017-01-01	6745
2017-04-01	6572
2017-07-01	5875
2017-10-01	3642
2018-01-01	3705
2018-04-01	4759