Quarter	Millions of US Dollars
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
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	25
1979-04-01	25
1979-07-01	25
1979-10-01	25
1980-01-01	30
1980-04-01	87
1980-07-01	85
1980-10-01	81
1981-01-01	48
1981-04-01	0
1981-07-01	0
1981-10-01	0
1982-01-01	0
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	50
1984-07-01	150
1984-10-01	228
1985-01-01	229
1985-04-01	179
1985-07-01	84
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	4
1987-01-01	4
1987-04-01	4
1987-07-01	4
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	0
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	111
1991-01-01	178
1991-04-01	145
1991-07-01	151
1991-10-01	80
1992-01-01	361
1992-04-01	365
1992-07-01	371
1992-10-01	510
1993-01-01	305
1993-04-01	296
1993-07-01	429
1993-10-01	315
1994-01-01	606
1994-04-01	634
1994-07-01	520
1994-10-01	588
1995-01-01	651
1995-04-01	1044
1995-07-01	1577
1995-10-01	1831
1996-01-01	1804
1996-04-01	1512
1996-07-01	1116
1996-10-01	1103
1997-01-01	1375
1997-04-01	1683
1997-07-01	1478
1997-10-01	1709
1998-01-01	1613
1998-04-01	1334
1998-07-01	2104
1998-10-01	2337
1999-01-01	2168
1999-04-01	2540
1999-07-01	2251
1999-10-01	1945
2000-01-01	1010
2000-04-01	826
2000-07-01	446
2000-10-01	1223
2001-01-01	1325
2001-04-01	1204
2001-07-01	1470
2001-10-01	932
2002-01-01	869
2002-04-01	1360
2002-07-01	1891
2002-10-01	2164
2003-01-01	3049
2003-04-01	3024
2003-07-01	2429
2003-10-01	2370
2004-01-01	1005
2004-04-01	381
2004-07-01	724
2004-10-01	2627
2005-01-01	2272
2005-04-01	3430
2005-07-01	2924
2005-10-01	1381
2006-01-01	1395
2006-04-01	100
2006-07-01	100
2006-10-01	252
2007-01-01	466
2007-04-01	446
2007-07-01	484
2007-10-01	260
2008-01-01	2016
2008-04-01	2444
2008-07-01	3558
2008-10-01	3459
2009-01-01	2955
2009-04-01	2791
2009-07-01	4464
2009-10-01	4744
2010-01-01	4286
2010-04-01	5121
2010-07-01	5045
2010-10-01	7641
2011-01-01	6929
2011-04-01	5410
2011-07-01	4565
2011-10-01	2641
2012-01-01	4577
2012-04-01	4058
2012-07-01	3455
2012-10-01	3979
2013-01-01	3319
2013-04-01	4431
2013-07-01	8075
2013-10-01	6594
2014-01-01	6808
2014-04-01	5534
2014-07-01	2612
2014-10-01	3325
2015-01-01	1688
2015-04-01	2486
2015-07-01	4128
2015-10-01	3664
2016-01-01	3055
2016-04-01	3725
2016-07-01	3717
2016-10-01	3211
2017-01-01	5497
2017-04-01	6319
2017-07-01	4674
2017-10-01	4472
2018-01-01	5512
2018-04-01	4303