Quarter	Millions of US Dollars
1972-04-01	25
1973-04-01	37
1973-10-01	18
1974-01-01	16
1974-04-01	17
1975-01-01	25
1977-01-01	38
1977-04-01	37
1977-07-01	87
1978-01-01	139
1978-04-01	112
1978-07-01	104
1978-10-01	128
1979-01-01	170
1979-04-01	-18
1979-07-01	221
1980-04-01	21
1980-07-01	117
1981-04-01	46
1981-07-01	43
1981-10-01	68
1982-01-01	314
1982-04-01	200
1982-07-01	37
1982-10-01	387
1983-01-01	36
1983-04-01	233
1983-07-01	1203
1983-10-01	65
1984-01-01	384
1984-04-01	28
1984-07-01	146
1984-10-01	702
1985-01-01	29
1985-04-01	906
1985-07-01	-20
1985-10-01	1330
1986-01-01	306
1986-04-01	-59
1986-07-01	-158
1986-10-01	-41
1987-04-01	5
1987-07-01	84
1987-10-01	128
1988-01-01	139
1988-04-01	-393
1988-07-01	237
1988-10-01	159
1989-01-01	66
1989-04-01	-292
1989-07-01	-4
1989-10-01	153
1990-01-01	-145
1990-04-01	560
1990-07-01	14
1990-10-01	-418
1991-04-01	82
1991-07-01	-117
1991-10-01	-193
1992-01-01	183
1992-04-01	-227
1992-10-01	2056
1993-01-01	232
1993-04-01	-45
1993-07-01	-1036
1993-10-01	-298
1994-01-01	1235
1994-04-01	-589
1994-07-01	521
1994-10-01	-432
1995-01-01	90
1995-04-01	-535
1995-07-01	53
1995-10-01	110
1996-01-01	533
1996-04-01	238
1996-07-01	1698
1996-10-01	951
1997-01-01	34
1997-04-01	1151
1997-07-01	100
1997-10-01	1172
1998-01-01	17
1998-04-01	4572
1998-07-01	-340
1998-10-01	830
1999-01-01	1635
1999-04-01	1622
1999-07-01	-562
1999-10-01	1225
2000-01-01	668
2000-04-01	343
2000-07-01	490
2000-10-01	781
2001-01-01	-347
2001-04-01	1758
2001-07-01	286
2001-10-01	630
2002-01-01	1908
2002-04-01	-782
2002-07-01	2738
2002-10-01	-429
2003-01-01	639
2003-04-01	143
2003-07-01	369
2003-10-01	1656
2004-01-01	553
2004-04-01	1183
2004-07-01	1562
2004-10-01	1371
2005-01-01	1256
2005-04-01	2409
2005-07-01	-438
2005-10-01	1877
2006-01-01	4797
2006-04-01	-726
2006-07-01	1048
2006-10-01	-1049
2007-01-01	2483
2007-04-01	-1326
2007-07-01	-480
2007-10-01	-100
2008-01-01	2338
2008-04-01	-1270
2008-07-01	-13
2008-10-01	-1568
2009-01-01	4885
2009-04-01	2150
2009-07-01	976
2009-10-01	811
2010-01-01	4060
2010-04-01	1250
2010-07-01	965
2010-10-01	2486
2011-01-01	1461
2011-04-01	1994
2011-07-01	4204
2011-10-01	-597
2012-01-01	4787
2012-04-01	8595
2012-07-01	1871
2012-10-01	1534
2013-01-01	-1000
2013-04-01	1898
2013-07-01	3179
2013-10-01	879
2014-01-01	4750
2014-04-01	3083
2014-07-01	-185
2014-10-01	6140
2015-01-01	7330
2015-04-01	-1953
2015-07-01	9397
2015-10-01	6745
2016-01-01	2410
2016-04-01	8226
2016-07-01	-197
2016-10-01	5628
2017-01-01	3138
2017-04-01	815
2017-07-01	7833
2017-10-01	8904
2018-01-01	20
2018-04-01	6883