Quarter	Millions of US Dollars
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	0
1984-07-01	0
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	0
1985-10-01	25
1986-01-01	25
1986-04-01	25
1986-07-01	25
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	25
1995-01-01	25
1995-04-01	0
1995-07-01	0
1995-10-01	20
1996-01-01	76
1996-04-01	106
1996-07-01	98
1996-10-01	98
1997-01-01	70
1997-04-01	45
1997-07-01	50
1997-10-01	790
1998-01-01	773
1998-04-01	788
1998-07-01	789
1998-10-01	49
1999-01-01	24
1999-04-01	15
1999-07-01	0
1999-10-01	3
2000-01-01	3
2000-04-01	3
2000-07-01	3
2000-10-01	0
2001-01-01	690
2001-04-01	759
2001-07-01	759
2001-10-01	759
2002-01-01	1004
2002-04-01	936
2002-07-01	973
2002-10-01	965
2003-01-01	947
2003-04-01	947
2003-07-01	910
2003-10-01	0
2004-01-01	67
2004-04-01	67
2004-07-01	67
2004-10-01	67
2005-01-01	100
2005-04-01	100
2005-07-01	100
2005-10-01	100
2006-01-01	703
2006-04-01	805
2006-07-01	1787
2006-10-01	1787
2007-01-01	2526
2007-04-01	2424
2007-07-01	1442
2007-10-01	1592
2008-01-01	150
2008-04-01	150
2008-07-01	150
2008-10-01	50
2009-01-01	50
2009-04-01	790
2009-07-01	809
2009-10-01	750
2010-01-01	717
2010-04-01	0
2010-07-01	0
2010-10-01	0
2011-01-01	13
2011-04-01	13
2011-07-01	13
2011-10-01	257
2012-01-01	251
2012-04-01	276
2012-07-01	291
2012-10-01	72
2013-01-01	65
2013-04-01	40
2013-07-01	175
2013-10-01	1188
2014-01-01	1962
2014-04-01	2358
2014-07-01	2177
2014-10-01	1174
2015-01-01	1300
2015-04-01	2123
2015-07-01	2363
2015-10-01	2363
2016-01-01	2663
2016-04-01	1440
2016-07-01	1900
2016-10-01	1900
2017-01-01	1678
2017-04-01	2763
2017-07-01	2060
2017-10-01	2290
2018-01-01	2320
2018-04-01	1543