Quarter	Millions of US Dollars
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	50
1981-07-01	50
1981-10-01	50
1982-01-01	50
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	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	31
1987-01-01	33
1987-04-01	33
1987-07-01	33
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	99
1990-07-01	145
1990-10-01	147
1991-01-01	142
1991-04-01	36
1991-07-01	75
1991-10-01	117
1992-01-01	193
1992-04-01	206
1992-07-01	139
1992-10-01	88
1993-01-01	0
1993-04-01	0
1993-07-01	0
1993-10-01	89
1994-01-01	146
1994-04-01	253
1994-07-01	363
1994-10-01	251
1995-01-01	229
1995-04-01	133
1995-07-01	70
1995-10-01	118
1996-01-01	115
1996-04-01	222
1996-07-01	45
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	0
1998-04-01	0
1998-07-01	116
1998-10-01	116
1999-01-01	107
1999-04-01	103
1999-07-01	0
1999-10-01	0
2000-01-01	0
2000-04-01	63
2000-07-01	57
2000-10-01	61
2001-01-01	58
2001-04-01	0
2001-07-01	118
2001-10-01	424
2002-01-01	563
2002-04-01	662
2002-07-01	343
2002-10-01	769
2003-01-01	278
2003-04-01	666
2003-07-01	450
2003-10-01	135
2004-01-01	48
2004-04-01	344
2004-07-01	188
2004-10-01	395
2005-01-01	700
2005-04-01	562
2005-07-01	241
2005-10-01	573
2006-01-01	0
2006-04-01	394
2006-07-01	187
2006-10-01	706
2007-01-01	0
2007-04-01	777
2007-07-01	638
2007-10-01	1064
2008-01-01	1553
2008-04-01	1056
2008-07-01	1153
2008-10-01	2699
2009-01-01	2328
2009-04-01	2472
2009-07-01	2560
2009-10-01	1323
2010-01-01	2761
2010-04-01	2967
2010-07-01	3648
2010-10-01	3336
2011-01-01	2272
2011-04-01	762
2011-07-01	338
2011-10-01	338
2012-01-01	7
2012-04-01	44
2012-07-01	36
2012-10-01	1972
2013-01-01	2042
2013-04-01	1309
2013-07-01	1347
2013-10-01	510
2014-01-01	1576
2014-04-01	1527
2014-07-01	1704
2014-10-01	1512
2015-01-01	512
2015-04-01	914
2015-07-01	639
2015-10-01	1308
2016-01-01	1440
2016-04-01	1107
2016-07-01	1135
2016-10-01	526
2017-01-01	570
2017-04-01	1747
2017-07-01	1011
2017-10-01	1181
2018-01-01	1363
2018-04-01	1178