Quarter	Millions of US Dollars
1990-07-01	0
1990-10-01	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	111
1992-10-01	111
1993-01-01	111
1993-04-01	111
1994-04-01	20
1994-07-01	20
1994-10-01	20
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	20
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	534
1998-01-01	540
1998-04-01	590
1998-07-01	590
1998-10-01	106
1999-01-01	115
1999-04-01	334
1999-07-01	582
1999-10-01	1950
2000-01-01	1919
2000-04-01	1545
2000-07-01	1404
2000-10-01	450
2001-01-01	469
2001-04-01	345
2001-07-01	274
2001-10-01	1802
2002-01-01	1382
2002-04-01	2462
2002-07-01	2790
2002-10-01	2080
2003-01-01	2354
2003-04-01	1256
2003-07-01	1422
2003-10-01	1666
2004-01-01	1307
2004-04-01	2368
2004-07-01	1871
2004-10-01	1197
2005-01-01	1787
2005-04-01	605
2005-07-01	1204
2005-10-01	1416
2006-01-01	1422
2006-04-01	1494
2006-07-01	1155
2006-10-01	2249
2007-01-01	2412
2007-04-01	2898
2007-07-01	2666
2007-10-01	2192
2008-01-01	4227
2008-04-01	5010
2008-07-01	4697
2008-10-01	4148
2009-01-01	2398
2009-04-01	1844
2009-07-01	2194
2009-10-01	2860
2010-01-01	3312
2010-04-01	2606
2010-07-01	2921
2010-10-01	1914
2011-01-01	1563
2011-04-01	2460
2011-07-01	3388
2011-10-01	3937
2012-01-01	8906
2012-04-01	8514
2012-07-01	7287
2012-10-01	6641
2013-01-01	5769
2013-04-01	7874
2013-07-01	8936
2013-10-01	8486
2014-01-01	4220
2014-04-01	2848
2014-07-01	2930
2014-10-01	6043
2015-01-01	10113
2015-04-01	9137
2015-07-01	10066
2015-10-01	6578
2016-01-01	6923
2016-04-01	7038
2016-07-01	5058
2016-10-01	4469
2017-01-01	1081
2017-04-01	4430
2017-07-01	4524
2017-10-01	4685
2018-01-01	7487
2018-04-01	3889