Quarter	Millions of US Dollars
1970-10-01	15
1971-10-01	25
1972-01-01	40
1972-04-01	39
1972-07-01	122
1972-10-01	59
1973-01-01	256
1973-04-01	29
1973-07-01	34
1973-10-01	50
1974-01-01	53
1974-04-01	64
1975-04-01	166
1975-07-01	50
1975-10-01	60
1976-01-01	81
1976-04-01	172
1976-07-01	100
1976-10-01	203
1977-01-01	20
1977-04-01	149
1977-07-01	114
1977-10-01	190
1978-01-01	135
1978-04-01	29
1978-07-01	30
1978-10-01	35
1979-01-01	128
1979-04-01	-6
1979-07-01	-30
1979-10-01	100
1980-04-01	125
1980-07-01	-50
1980-10-01	-60
1981-01-01	25
1981-04-01	-80
1981-07-01	-48
1981-10-01	-135
1982-01-01	-8
1982-04-01	-43
1983-04-01	-5
1983-10-01	-30
1984-01-01	-108
1984-07-01	100
1984-10-01	157
1985-01-01	-25
1985-04-01	46
1985-07-01	-95
1985-10-01	228
1986-01-01	149
1986-04-01	488
1986-07-01	19
1986-10-01	571
1987-01-01	461
1987-04-01	584
1987-07-01	-184
1987-10-01	-416
1988-01-01	-174
1988-04-01	-172
1988-07-01	-229
1988-10-01	491
1989-01-01	1
1989-04-01	-149
1989-07-01	-1
1989-10-01	55
1990-01-01	857
1990-04-01	278
1990-07-01	1349
1990-10-01	1781
1991-01-01	1946
1991-04-01	2419
1991-07-01	2050
1991-10-01	2076
1992-01-01	1364
1992-04-01	1569
1992-07-01	969
1992-10-01	2217
1993-01-01	677
1993-04-01	1331
1993-07-01	3658
1993-10-01	683
1994-01-01	478
1994-04-01	875
1994-07-01	1664
1994-10-01	946
1995-01-01	-626
1995-04-01	2804
1995-07-01	125
1995-10-01	4486
1996-01-01	3590
1996-04-01	963
1996-07-01	1009
1996-10-01	341
1997-01-01	3503
1997-04-01	5607
1997-07-01	3601
1997-10-01	3458
1998-01-01	7851
1998-04-01	6726
1998-07-01	3958
1998-10-01	4852
1999-01-01	4672
1999-04-01	12358
1999-07-01	7601
1999-10-01	10743
2000-01-01	7888
2000-04-01	14767
2000-07-01	7025
2000-10-01	9960
2001-01-01	6161
2001-04-01	1730
2001-07-01	-4239
2001-10-01	471
2002-01-01	2777
2002-04-01	4013
2002-07-01	2479
2002-10-01	1545
2003-01-01	623
2003-04-01	2205
2003-07-01	6351
2003-10-01	3214
2004-01-01	-3223
2004-04-01	1743
2004-07-01	-636
2004-10-01	3994
2005-01-01	-488
2005-04-01	1642
2005-07-01	643
2005-10-01	7946
2006-01-01	14722
2006-04-01	540
2006-07-01	13744
2006-10-01	2617
2007-01-01	6657
2007-04-01	1981
2007-07-01	9454
2007-10-01	3412
2008-01-01	682
2008-04-01	8575
2008-07-01	313
2008-10-01	11849
2009-01-01	6012
2009-04-01	6669
2009-07-01	-3192
2009-10-01	-1087
2010-01-01	5955
2010-04-01	-161
2010-07-01	2109
2010-10-01	-4052
2011-01-01	3079
2011-04-01	14734
2011-07-01	2722
2011-10-01	8507
2012-01-01	15035
2012-04-01	2741
2012-07-01	8420
2012-10-01	4476
2013-01-01	8162
2013-04-01	-4526
2013-07-01	15092
2013-10-01	5256
2014-01-01	-15566
2014-04-01	-8810
2014-07-01	20822
2014-10-01	2564
2015-01-01	-1791
2015-04-01	6738
2015-07-01	3654
2015-10-01	13469
2016-01-01	8207
2016-04-01	1538
2016-07-01	2043
2016-10-01	-169
2017-01-01	-1541
2017-04-01	732
2017-07-01	3596
2017-10-01	1477
2018-01-01	-4525
2018-04-01	15097