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
1994-07-01	9
1994-10-01	14
1995-01-01	-295
1995-04-01	-307
1995-07-01	1033
1995-10-01	157
1996-01-01	404
1996-04-01	1433
1996-07-01	-448
1996-10-01	-739
1997-01-01	661
1997-04-01	757
1997-07-01	657
1997-10-01	629
1998-01-01	921
1998-04-01	701
1998-07-01	-167
1998-10-01	-1479
1999-01-01	1042
1999-04-01	288
1999-07-01	0
1999-10-01	2879
2000-01-01	2106
2000-04-01	1905
2000-07-01	1645
2000-10-01	-143
2001-01-01	456
2001-04-01	-656
2001-07-01	-82
2001-10-01	361
2002-01-01	852
2002-04-01	-356
2002-07-01	-236
2002-10-01	-35
2003-01-01	226
2003-04-01	929
2003-07-01	404
2003-10-01	-769
2004-01-01	-30
2004-04-01	945
2004-07-01	398
2004-10-01	1850
2005-01-01	1895
2005-04-01	2420
2005-07-01	772
2005-10-01	1809
2006-01-01	2628
2006-04-01	650
2006-07-01	2622
2006-10-01	1166
2007-01-01	4068
2007-04-01	239
2007-07-01	-550
2007-10-01	1250
2008-01-01	-1198
2008-04-01	500
2008-07-01	1300
2008-10-01	-850
2009-01-01	1650
2009-04-01	250
2009-07-01	42
2009-10-01	-550
2010-01-01	1618
2010-04-01	371
2010-07-01	2862
2010-10-01	1652
2011-01-01	2796
2011-04-01	256
2011-07-01	-282
2011-10-01	1220
2012-01-01	2834
2012-04-01	2075
2012-07-01	2100
2012-10-01	6205
2013-01-01	2723
2013-04-01	6200
2013-07-01	1165
2013-10-01	6834
2014-01-01	755
2014-04-01	6571
2014-07-01	6281
2014-10-01	4894
2015-01-01	2113
2015-04-01	1133
2015-07-01	-1563
2015-10-01	-990
2016-01-01	1725
2016-04-01	5908
2016-07-01	-2153
2016-10-01	3322
2017-01-01	5447
2017-04-01	8997
2017-07-01	-223
2017-10-01	3964
2018-01-01	2870
2018-04-01	-1363