Quarter	Millions of US Dollars
1972-10-01	20
1975-01-01	35
1976-10-01	42
1977-01-01	42
1977-07-01	240
1977-10-01	89
1978-01-01	143
1978-04-01	74
1978-07-01	51
1978-10-01	37
1979-01-01	54
1979-07-01	116
1979-10-01	72
1980-01-01	-35
1980-07-01	55
1981-07-01	14
1982-01-01	-1
1982-07-01	-50
1982-10-01	18
1984-07-01	-51
1985-10-01	-163
1986-04-01	-134
1986-10-01	-51
1987-01-01	-54
1987-04-01	-3
1987-07-01	-177
1987-10-01	-97
1988-04-01	-2
1988-07-01	-54
1988-10-01	-39
1989-07-01	-63
1989-10-01	-19
1990-01-01	-82
1990-04-01	-21
1990-07-01	-6
1991-07-01	467
1991-10-01	901
1992-01-01	487
1992-04-01	675
1992-07-01	70
1992-10-01	-251
1993-01-01	-80
1993-04-01	430
1993-07-01	459
1993-10-01	852
1994-01-01	29
1994-04-01	-27
1994-07-01	8
1994-10-01	-77
1995-01-01	-218
1995-04-01	-2
1995-07-01	142
1995-10-01	790
1996-01-01	848
1996-04-01	1930
1996-07-01	939
1996-10-01	3138
1997-01-01	199
1997-04-01	1055
1997-07-01	1943
1997-10-01	173
1998-01-01	844
1998-04-01	439
1998-07-01	-666
1998-10-01	-754
1999-01-01	-893
1999-04-01	-280
1999-07-01	131
1999-10-01	288
2000-01-01	296
2000-04-01	318
2000-07-01	-28
2000-10-01	-395
2001-01-01	269
2001-04-01	-747
2001-07-01	-167
2001-10-01	154
2002-01-01	-381
2002-04-01	-205
2002-07-01	-299
2002-10-01	-808
2003-01-01	45
2003-04-01	431
2003-07-01	736
2003-10-01	895
2004-01-01	693
2004-04-01	-1242
2004-07-01	-1116
2004-10-01	-1962
2005-01-01	-591
2005-04-01	-578
2005-07-01	79
2005-10-01	839
2006-01-01	1536
2006-04-01	533
2006-07-01	1366
2006-10-01	-185
2007-01-01	530
2007-04-01	-247
2007-07-01	-875
2007-10-01	-54
2008-01-01	-615
2008-04-01	-264
2008-07-01	-721
2008-10-01	-781
2009-01-01	-341
2009-04-01	1280
2009-07-01	1718
2009-10-01	771
2010-01-01	2579
2010-04-01	60
2010-07-01	1324
2010-10-01	2942
2011-01-01	-925
2011-04-01	4054
2011-07-01	2355
2011-10-01	1747
2012-01-01	2750
2012-04-01	1336
2012-07-01	2361
2012-10-01	851
2013-01-01	498
2013-04-01	1099
2013-07-01	-1660
2013-10-01	389
2014-01-01	-529
2014-04-01	979
2014-07-01	1407
2014-10-01	842
2015-01-01	-883
2015-04-01	1780
2015-07-01	0
2015-10-01	-800
2016-01-01	-41
2016-04-01	-619
2016-07-01	-639
2016-10-01	-490
2017-01-01	-944
2017-04-01	-243
2017-10-01	517
2018-01-01	1109
2018-04-01	-1157