Quarter	Millions of US Dollars
1976-04-01	24
1985-04-01	28
1985-10-01	33
1986-04-01	36
1986-10-01	61
1987-01-01	130
1987-10-01	112
1988-01-01	376
1988-04-01	380
1988-07-01	50
1988-10-01	399
1989-01-01	79
1989-04-01	216
1989-07-01	502
1989-10-01	350
1990-01-01	200
1990-04-01	213
1990-07-01	150
1990-10-01	96
1991-04-01	267
1991-10-01	300
1992-01-01	285
1992-04-01	215
1992-07-01	1052
1992-10-01	913
1993-01-01	1118
1993-04-01	431
1993-07-01	596
1993-10-01	1590
1994-01-01	490
1994-04-01	-16
1995-01-01	-307
1995-04-01	-302
1995-07-01	1039
1995-10-01	127
1996-01-01	385
1996-04-01	1383
1996-07-01	-565
1996-10-01	-752
1997-01-01	442
1997-04-01	727
1997-07-01	686
1997-10-01	292
1998-01-01	755
1998-04-01	589
1998-07-01	-784
1998-10-01	-1479
1999-01-01	1042
1999-04-01	287
1999-07-01	-3
1999-10-01	2753
2000-01-01	2164
2000-04-01	1941
2000-07-01	1266
2000-10-01	-135
2001-01-01	456
2001-04-01	-612
2001-07-01	-3
2001-10-01	444
2002-01-01	862
2002-04-01	-446
2002-07-01	-75
2002-10-01	326
2003-01-01	317
2003-04-01	1030
2003-07-01	675
2003-10-01	-744
2004-01-01	-46
2004-04-01	750
2004-07-01	211
2004-10-01	993
2005-01-01	1388
2005-04-01	795
2005-07-01	-93
2005-10-01	1159
2006-01-01	2408
2006-04-01	-643
2006-07-01	2584
2006-10-01	866
2007-01-01	3368
2007-04-01	-111
2007-07-01	-550
2007-10-01	1250
2008-01-01	-1298
2008-04-01	500
2008-07-01	1500
2008-10-01	-600
2009-01-01	1000
2009-04-01	250
2009-07-01	392
2010-01-01	1618
2010-04-01	221
2010-07-01	2962
2010-10-01	1652
2011-01-01	2906
2011-04-01	1188
2011-07-01	-282
2011-10-01	1870
2012-01-01	4034
2012-04-01	2910
2012-07-01	2250
2012-10-01	7240
2013-01-01	2583
2013-04-01	7440
2013-07-01	1065
2013-10-01	8464
2014-01-01	1055
2014-04-01	10777
2014-07-01	6582
2014-10-01	5082
2015-01-01	2284
2015-04-01	1363
2015-07-01	-1542
2015-10-01	-970
2016-01-01	2161
2016-04-01	6020
2016-07-01	-2149
2016-10-01	4133
2017-01-01	5412
2017-04-01	10272
2017-07-01	1081
2017-10-01	3606
2018-01-01	3423
2018-04-01	-1544