Quarter	Millions of US Dollars
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	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	0
1985-01-01	0
1985-04-01	23
1985-07-01	24
1985-10-01	24
1986-01-01	24
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	0
1988-07-01	50
1988-10-01	50
1989-01-01	50
1989-04-01	50
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
1991-01-01	73
1991-04-01	120
1991-07-01	128
1991-10-01	330
1992-01-01	231
1992-04-01	290
1992-07-01	309
1992-10-01	179
1993-01-01	399
1993-04-01	303
1993-07-01	308
1993-10-01	216
1994-01-01	293
1994-04-01	783
1994-07-01	963
1994-10-01	1614
1995-01-01	1473
1995-04-01	1496
1995-07-01	1880
1995-10-01	2043
1996-01-01	2629
1996-04-01	2364
1996-07-01	1920
1996-10-01	1805
1997-01-01	1364
1997-04-01	1512
1997-07-01	1940
1997-10-01	3328
1998-01-01	3067
1998-04-01	3592
1998-07-01	3449
1998-10-01	1612
1999-01-01	2647
1999-04-01	1751
1999-07-01	1845
1999-10-01	2230
2000-01-01	1012
2000-04-01	1686
2000-07-01	1201
2000-10-01	2179
2001-01-01	2432
2001-04-01	3046
2001-07-01	3337
2001-10-01	3236
2002-01-01	3785
2002-04-01	4097
2002-07-01	4567
2002-10-01	4476
2003-01-01	5603
2003-04-01	4459
2003-07-01	4204
2003-10-01	4171
2004-01-01	3186
2004-04-01	4055
2004-07-01	4682
2004-10-01	4202
2005-01-01	2290
2005-04-01	1792
2005-07-01	704
2005-10-01	2986
2006-01-01	2527
2006-04-01	2907
2006-07-01	3649
2006-10-01	1738
2007-01-01	4865
2007-04-01	3875
2007-07-01	3359
2007-10-01	4236
2008-01-01	1050
2008-04-01	2300
2008-07-01	3308
2008-10-01	2985
2009-01-01	4279
2009-04-01	4831
2009-07-01	3684
2009-10-01	3111
2010-01-01	2791
2010-04-01	2148
2010-07-01	2566
2010-10-01	3044
2011-01-01	4263
2011-04-01	4085
2011-07-01	5381
2011-10-01	5494
2012-01-01	4871
2012-04-01	4994
2012-07-01	3485
2012-10-01	3930
2013-01-01	5650
2013-04-01	5525
2013-07-01	6284
2013-10-01	5516
2014-01-01	5135
2014-04-01	6233
2014-07-01	8225
2014-10-01	9552
2015-01-01	8054
2015-04-01	8110
2015-07-01	8725
2015-10-01	7796
2016-01-01	7522
2016-04-01	7601
2016-07-01	8684
2016-10-01	8150
2017-01-01	9229
2017-04-01	13986
2017-07-01	10605
2017-10-01	14717
2018-01-01	13200
2018-04-01	12947