Quarter	Millions of US Dollars
1962-10-01	6
1966-01-01	80
1966-04-01	30
1966-07-01	15
1967-01-01	14
1967-04-01	105
1967-10-01	22
1968-01-01	298
1968-04-01	495
1968-07-01	170
1968-10-01	91
1969-01-01	227
1969-04-01	30
1969-07-01	30
1969-10-01	158
1970-01-01	27
1970-04-01	15
1970-07-01	75
1970-10-01	35
1971-01-01	826
1971-04-01	296
1971-07-01	238
1971-10-01	620
1972-01-01	1568
1972-04-01	2024
1972-07-01	1614
1972-10-01	2006
1973-01-01	1796
1973-04-01	1242
1973-07-01	1041
1973-10-01	1494
1974-01-01	971
1974-04-01	1185
1974-07-01	1377
1974-10-01	2104
1975-01-01	3485
1975-04-01	4352
1975-07-01	3086
1975-10-01	4862
1976-01-01	7114
1976-04-01	5441
1976-07-01	4628
1976-10-01	6391
1977-01-01	5856
1977-04-01	6201
1977-07-01	5028
1977-10-01	5780
1978-01-01	6357
1978-04-01	6925
1978-07-01	4612
1978-10-01	4465
1979-01-01	7718
1979-04-01	6352
1979-07-01	5399
1979-10-01	4554
1980-01-01	4198
1980-04-01	7220
1980-07-01	4456
1980-10-01	6004
1981-01-01	5165
1981-04-01	6023
1981-07-01	6885
1981-10-01	10610
1982-01-01	14386
1982-04-01	11990
1982-07-01	12074
1982-10-01	10880
1983-01-01	13751
1983-04-01	9770
1983-07-01	5381
1983-10-01	14414
1984-01-01	17794
1984-04-01	12139
1984-07-01	17694
1984-10-01	23908
1985-01-01	20301
1985-04-01	19122
1985-07-01	21572
1985-10-01	17845
1986-01-01	24772
1986-04-01	37971
1986-07-01	36651
1986-10-01	27646
1987-01-01	27153
1987-04-01	27976
1987-07-01	21858
1987-10-01	8697
1988-01-01	19621
1988-04-01	32441
1988-07-01	36520
1988-10-01	22174
1989-01-01	42227
1989-04-01	40920
1989-07-01	28297
1989-10-01	33815
1990-01-01	26261
1990-04-01	10751
1990-07-01	34303
1990-10-01	25573
1991-01-01	36150
1991-04-01	35787
1991-07-01	29589
1991-10-01	27291
1992-01-01	17494
1992-04-01	23769
1992-07-01	8278
1992-10-01	31338
1993-01-01	20781
1993-04-01	3177
1993-07-01	113930
1993-10-01	36938
1994-01-01	57584
1994-04-01	28650
1994-07-01	57047
1994-10-01	35494
1995-01-01	47750
1995-04-01	48420
1995-07-01	59569
1995-10-01	55712
1996-01-01	80322
1996-04-01	93373
1996-07-01	73591
1996-10-01	108732
1997-01-01	104085
1997-04-01	92325
1997-07-01	108439
1997-10-01	37741
1998-01-01	114972
1998-04-01	138005
1998-07-01	98302
1998-10-01	56788
1999-01-01	183370
1999-04-01	229253
1999-07-01	228461
1999-10-01	134039
2000-01-01	180514
2000-04-01	227718
2000-07-01	217301
2000-10-01	254814
2001-01-01	346893
2001-04-01	277367
2001-07-01	143872
2001-10-01	268468
2002-01-01	215059
2002-04-01	252275
2002-07-01	106112
2002-10-01	123927
2003-01-01	256512
2003-04-01	253203
2003-07-01	218996
2003-10-01	338515
2004-01-01	336258
2004-04-01	241265
2004-07-01	269454
2004-10-01	308754
2005-01-01	343045
2005-04-01	362119
2005-07-01	149157
2005-10-01	428191
2006-01-01	469591
2006-04-01	472944
2006-07-01	448574
2006-10-01	686817
2007-01-01	705381
2007-04-01	848435
2007-07-01	252658
2007-10-01	245172
2008-01-01	273303
2008-04-01	740806
2008-07-01	159118
2008-10-01	361632
2009-01-01	299124
2009-04-01	393869
2009-07-01	244091
2009-10-01	92298
2010-01-01	272470
2010-04-01	-92521
2010-07-01	180522
2010-10-01	-36707
2011-01-01	127058
2011-04-01	24277
2011-07-01	-60853
2011-10-01	-20455
2012-01-01	170335
2012-04-01	-181526
2012-07-01	-50977
2012-10-01	76864
2013-01-01	-68074
2013-04-01	-62262
2013-07-01	25677
2013-10-01	90764
2014-01-01	-84861
2014-04-01	156049
2014-07-01	106642
2014-10-01	-25644
2015-01-01	151422
2015-04-01	137864
2015-07-01	34363
2015-10-01	-78825
2016-01-01	136220
2016-04-01	114325
2016-07-01	151132
2016-10-01	-25309
2017-01-01	157984
2017-04-01	175870
2017-07-01	170934
2017-10-01	103073
2018-01-01	140547
2018-04-01	188895