Quarter	Millions of US Dollars
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	0
1984-07-01	0
1984-10-01	5
1985-01-01	5
1985-04-01	5
1985-07-01	5
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	0
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	45
1988-07-01	83
1988-10-01	85
1989-01-01	81
1989-04-01	36
1989-07-01	0
1989-10-01	35
1990-01-01	32
1990-04-01	66
1990-07-01	72
1990-10-01	37
1991-01-01	36
1991-04-01	20
1991-07-01	20
1991-10-01	23
1992-01-01	20
1992-04-01	110
1992-07-01	197
1992-10-01	517
1993-01-01	571
1993-04-01	528
1993-07-01	576
1993-10-01	280
1994-01-01	567
1994-04-01	526
1994-07-01	612
1994-10-01	802
1995-01-01	564
1995-04-01	659
1995-07-01	685
1995-10-01	1239
1996-01-01	1334
1996-04-01	1333
1996-07-01	1183
1996-10-01	881
1997-01-01	904
1997-04-01	1147
1997-07-01	1750
1997-10-01	1799
1998-01-01	2023
1998-04-01	1949
1998-07-01	1669
1998-10-01	1820
1999-01-01	1485
1999-04-01	1374
1999-07-01	1122
1999-10-01	1254
2000-01-01	1663
2000-04-01	1684
2000-07-01	2469
2000-10-01	2374
2001-01-01	2524
2001-04-01	3014
2001-07-01	3040
2001-10-01	3458
2002-01-01	3241
2002-04-01	3343
2002-07-01	3117
2002-10-01	3391
2003-01-01	2886
2003-04-01	3622
2003-07-01	3811
2003-10-01	3864
2004-01-01	4520
2004-04-01	3934
2004-07-01	3639
2004-10-01	3006
2005-01-01	2935
2005-04-01	2854
2005-07-01	3200
2005-10-01	3033
2006-01-01	4260
2006-04-01	4425
2006-07-01	5246
2006-10-01	6088
2007-01-01	6033
2007-04-01	5504
2007-07-01	4543
2007-10-01	3683
2008-01-01	3132
2008-04-01	3028
2008-07-01	2442
2008-10-01	1889
2009-01-01	1732
2009-04-01	2201
2009-07-01	2507
2009-10-01	3039
2010-01-01	3134
2010-04-01	3340
2010-07-01	3567
2010-10-01	5326
2011-01-01	5681
2011-04-01	6776
2011-07-01	6969
2011-10-01	6496
2012-01-01	6842
2012-04-01	7021
2012-07-01	7072
2012-10-01	5266
2013-01-01	5525
2013-04-01	6775
2013-07-01	8621
2013-10-01	9173
2014-01-01	9585
2014-04-01	7385
2014-07-01	5892
2014-10-01	8455
2015-01-01	8138
2015-04-01	9366
2015-07-01	9506
2015-10-01	8844
2016-01-01	8701
2016-04-01	11358
2016-07-01	11836
2016-10-01	10040
2017-01-01	10748
2017-04-01	7398
2017-07-01	6834
2017-10-01	9182
2018-01-01	9883
2018-04-01	9519