Quarter	Millions of US Dollars
1977-01-01	148
1977-04-01	137
1977-10-01	59
1978-04-01	98
1979-01-01	60
1982-01-01	110
1982-04-01	12
1983-01-01	91
1983-10-01	137
1984-01-01	296
1984-04-01	-74
1984-07-01	100
1984-10-01	608
1985-01-01	475
1985-04-01	154
1985-10-01	71
1986-01-01	-200
1986-07-01	-375
1986-10-01	-675
1987-01-01	-256
1987-04-01	-201
1988-01-01	-62
1988-04-01	-117
1988-10-01	-15
1989-01-01	-3
1989-04-01	-59
1989-07-01	-104
1989-10-01	-138
1990-01-01	-3
1990-07-01	300
1990-10-01	601
1991-01-01	-65
1991-10-01	1024
1992-01-01	969
1992-04-01	1412
1992-07-01	1852
1992-10-01	211
1993-01-01	2549
1993-04-01	1250
1993-07-01	512
1993-10-01	446
1994-01-01	-1
1994-04-01	315
1994-07-01	1723
1994-10-01	-160
1995-01-01	4175
1995-04-01	83
1995-07-01	186
1995-10-01	-74
1996-01-01	-90
1996-04-01	4
1996-07-01	2693
1996-10-01	747
1997-01-01	1245
1997-04-01	738
1997-07-01	1466
1997-10-01	-69
1998-01-01	820
1998-04-01	-7
1998-07-01	1695
1998-10-01	659
1999-01-01	-1023
1999-04-01	1461
1999-07-01	-1324
1999-10-01	298
2000-01-01	-1609
2000-04-01	110
2000-07-01	1428
2000-10-01	247
2001-01-01	242
2001-04-01	240
2001-07-01	30
2001-10-01	-253
2002-01-01	3388
2002-04-01	-965
2002-07-01	-65
2002-10-01	482
2003-01-01	-1429
2003-04-01	5564
2003-07-01	12
2003-10-01	-616
2004-01-01	159
2004-04-01	5125
2004-07-01	-1432
2004-10-01	-339
2005-01-01	-1696
2005-04-01	166
2005-07-01	-175
2005-10-01	1399
2006-01-01	717
2006-04-01	-501
2006-07-01	-2762
2006-10-01	8065
2007-01-01	-954
2007-04-01	600
2007-07-01	-345
2007-10-01	-952
2008-01-01	7685
2008-04-01	2029
2008-07-01	4677
2008-10-01	382
2009-01-01	2617
2009-04-01	2486
2009-07-01	7126
2009-10-01	-115
2010-01-01	4211
2010-04-01	703
2010-07-01	-431
2010-10-01	-1003
2011-01-01	238
2011-04-01	4287
2011-07-01	-1906
2011-10-01	-243
2012-01-01	-1872
2012-04-01	-1219
2012-07-01	-6578
2012-10-01	218
2013-01-01	3043
2013-04-01	-6823
2013-07-01	-6832
2013-10-01	899
2014-01-01	-1068
2014-04-01	-280
2014-07-01	361
2014-10-01	-517
2015-01-01	-7308
2015-04-01	-1624
2015-07-01	-2791
2015-10-01	-531
2016-01-01	1002
2016-04-01	-1582
2016-07-01	-26
2016-10-01	-1672
2017-01-01	-5583
2017-04-01	-619
2017-07-01	-5892
2017-10-01	-147
2018-01-01	-5446
2018-04-01	-1607