Quarter	Millions of US Dollars
1962-10-01	6
1966-01-01	65
1966-04-01	30
1966-07-01	15
1967-01-01	14
1967-04-01	105
1967-10-01	22
1968-01-01	188
1968-04-01	350
1968-07-01	140
1968-10-01	63
1969-01-01	137
1969-04-01	30
1969-07-01	30
1969-10-01	150
1970-01-01	27
1970-07-01	75
1970-10-01	15
1971-01-01	586
1971-04-01	201
1971-07-01	128
1971-10-01	385
1972-01-01	1165
1972-04-01	1564
1972-07-01	1511
1972-10-01	1748
1973-01-01	1654
1973-04-01	1203
1973-07-01	951
1973-10-01	1386
1974-01-01	1006
1974-04-01	1175
1974-07-01	1377
1974-10-01	2051
1975-01-01	3446
1975-04-01	4207
1975-07-01	3035
1975-10-01	4777
1976-01-01	6848
1976-04-01	5391
1976-07-01	4454
1976-10-01	6130
1977-01-01	5189
1977-04-01	5738
1977-07-01	4626
1977-10-01	5303
1978-01-01	6170
1978-04-01	6795
1978-07-01	4240
1978-10-01	4138
1979-01-01	7164
1979-04-01	5469
1979-07-01	5038
1979-10-01	4053
1980-01-01	3825
1980-04-01	5852
1980-07-01	3226
1980-10-01	4551
1981-01-01	3946
1981-04-01	5055
1981-07-01	5346
1981-10-01	8711
1982-01-01	10121
1982-04-01	7243
1982-07-01	8265
1982-10-01	7517
1983-01-01	10896
1983-04-01	7295
1983-07-01	3709
1983-10-01	11385
1984-01-01	13879
1984-04-01	9565
1984-07-01	15611
1984-10-01	21979
1985-01-01	19644
1985-04-01	18744
1985-07-01	20485
1985-10-01	18112
1986-01-01	24160
1986-04-01	36959
1986-07-01	35766
1986-10-01	27121
1987-01-01	26517
1987-04-01	26816
1987-07-01	21267
1987-10-01	8417
1988-01-01	19423
1988-04-01	31706
1988-07-01	34200
1988-10-01	21188
1989-01-01	39187
1989-04-01	38955
1989-07-01	26798
1989-10-01	32350
1990-01-01	24870
1990-04-01	11679
1990-07-01	28487
1990-10-01	25149
1991-01-01	32882
1991-04-01	35763
1991-07-01	29352
1991-10-01	27015
1992-01-01	20769
1992-04-01	25047
1992-07-01	4059
1992-10-01	31038
1993-01-01	22320
1993-04-01	5999
1993-07-01	110702
1993-10-01	33999
1994-01-01	54929
1994-04-01	26023
1994-07-01	52459
1994-10-01	27928
1995-01-01	40513
1995-04-01	39742
1995-07-01	50327
1995-10-01	47219
1996-01-01	71557
1996-04-01	83611
1996-07-01	63612
1996-10-01	86707
1997-01-01	86511
1997-04-01	83935
1997-07-01	88488
1997-10-01	16385
1998-01-01	99526
1998-04-01	118800
1998-07-01	86722
1998-10-01	54717
1999-01-01	173526
1999-04-01	209108
1999-07-01	210491
1999-10-01	126506
2000-01-01	162293
2000-04-01	217015
2000-07-01	204382
2000-10-01	236823
2001-01-01	323825
2001-04-01	264480
2001-07-01	132861
2001-10-01	255611
2002-01-01	214460
2002-04-01	232845
2002-07-01	107698
2002-10-01	133104
2003-01-01	258184
2003-04-01	257855
2003-07-01	226906
2003-10-01	343289
2004-01-01	341972
2004-04-01	245619
2004-07-01	274049
2004-10-01	313516
2005-01-01	334712
2005-04-01	371860
2005-07-01	146556
2005-10-01	405515
2006-01-01	425993
2006-04-01	433744
2006-07-01	381768
2006-10-01	589204
2007-01-01	631639
2007-04-01	756958
2007-07-01	202236
2007-10-01	240012
2008-01-01	291604
2008-04-01	761895
2008-07-01	174564
2008-10-01	372281
2009-01-01	295363
2009-04-01	405869
2009-07-01	263660
2009-10-01	115377
2010-01-01	282149
2010-04-01	-80959
2010-07-01	192155
2010-10-01	-17931
2011-01-01	135151
2011-04-01	41343
2011-07-01	-57309
2011-10-01	-9401
2012-01-01	198590
2012-04-01	-169067
2012-07-01	-38909
2012-10-01	90432
2013-01-01	-44401
2013-04-01	-60191
2013-07-01	36374
2013-10-01	94609
2014-01-01	-67685
2014-04-01	150432
2014-07-01	94110
2014-10-01	-33941
2015-01-01	139366
2015-04-01	126091
2015-07-01	19366
2015-10-01	-79551
2016-01-01	131141
2016-04-01	129731
2016-07-01	170026
2016-10-01	-22178
2017-01-01	154653
2017-04-01	135906
2017-07-01	164678
2017-10-01	70256
2018-01-01	94481
2018-04-01	113313