Quarter	Millions of US Dollars
1962-10-01	6
1966-01-01	80
1966-04-01	45
1966-07-01	30
1966-10-01	20
1967-01-01	39
1967-04-01	130
1967-07-01	20
1967-10-01	22
1968-01-01	298
1968-04-01	495
1968-07-01	210
1968-10-01	91
1969-01-01	227
1969-04-01	30
1969-07-01	30
1969-10-01	158
1970-01-01	73
1970-04-01	15
1970-07-01	275
1970-10-01	35
1971-01-01	988
1971-04-01	508
1971-07-01	283
1971-10-01	847
1972-01-01	2955
1972-04-01	2491
1972-07-01	2378
1972-10-01	2950
1973-01-01	2552
1973-04-01	2302
1973-07-01	1552
1973-10-01	2440
1974-01-01	1565
1974-04-01	2163
1974-07-01	1806
1974-10-01	3336
1975-01-01	4578
1975-04-01	5589
1975-07-01	4176
1975-10-01	7271
1976-01-01	9506
1976-04-01	7506
1976-07-01	7716
1976-10-01	9083
1977-01-01	7877
1977-04-01	8658
1977-07-01	8599
1977-10-01	8562
1978-01-01	9664
1978-04-01	9236
1978-07-01	8917
1978-10-01	7038
1979-01-01	9069
1979-04-01	8865
1979-07-01	8023
1979-10-01	6380
1980-01-01	5015
1980-04-01	9855
1980-07-01	6077
1980-10-01	7269
1981-01-01	6555
1981-04-01	8396
1981-07-01	8913
1981-10-01	14377
1982-01-01	16562
1982-04-01	13354
1982-07-01	15192
1982-10-01	13754
1983-01-01	15917
1983-04-01	14015
1983-07-01	8438
1983-10-01	17582
1984-01-01	20516
1984-04-01	14080
1984-07-01	19974
1984-10-01	29034
1985-01-01	24149
1985-04-01	24050
1985-07-01	25387
1985-10-01	17632
1986-01-01	31042
1986-04-01	39649
1986-07-01	37860
1986-10-01	28069
1987-01-01	32043
1987-04-01	29018
1987-07-01	22938
1987-10-01	11025
1988-01-01	22837
1988-04-01	32783
1988-07-01	38543
1988-10-01	25606
1989-01-01	47110
1989-04-01	44197
1989-07-01	32964
1989-10-01	33572
1990-01-01	77748
1990-04-01	25184
1990-07-01	50780
1990-10-01	51470
1991-01-01	65203
1991-04-01	50202
1991-07-01	41299
1991-10-01	44419
1992-01-01	47561
1992-04-01	38672
1992-07-01	22033
1992-10-01	53117
1993-01-01	28820
1993-04-01	60534
1993-07-01	137723
1993-10-01	70467
1994-01-01	76055
1994-04-01	77453
1994-07-01	73754
1994-10-01	55265
1995-01-01	48800
1995-04-01	57614
1995-07-01	79855
1995-10-01	67333
1996-01-01	102130
1996-04-01	123083
1996-07-01	99463
1996-10-01	145880
1997-01-01	141890
1997-04-01	136175
1997-07-01	145844
1997-10-01	46282
1998-01-01	152620
1998-04-01	178685
1998-07-01	112553
1998-10-01	44701
1999-01-01	209078
1999-04-01	254459
1999-07-01	238247
1999-10-01	148603
2000-01-01	210568
2000-04-01	241019
2000-07-01	263635
2000-10-01	262018
2001-01-01	364762
2001-04-01	290951
2001-07-01	158942
2001-10-01	274908
2002-01-01	235827
2002-04-01	264943
2002-07-01	119871
2002-10-01	133709
2003-01-01	272098
2003-04-01	280122
2003-07-01	239955
2003-10-01	356979
2004-01-01	369601
2004-04-01	266769
2004-07-01	293967
2004-10-01	339156
2005-01-01	380270
2005-04-01	377052
2005-07-01	191425
2005-10-01	467859
2006-01-01	520077
2006-04-01	485719
2006-07-01	479770
2006-10-01	762146
2007-01-01	770614
2007-04-01	940142
2007-07-01	270972
2007-10-01	284849
2008-01-01	300325
2008-04-01	790730
2008-07-01	183109
2008-10-01	342642
2009-01-01	311935
2009-04-01	492928
2009-07-01	321304
2009-10-01	153741
2010-01-01	355055
2010-04-01	-32285
2010-07-01	269933
2010-10-01	38323
2011-01-01	250780
2011-04-01	134548
2011-07-01	27810
2011-10-01	55484
2012-01-01	468480
2012-04-01	-66101
2012-07-01	100001
2012-10-01	229364
2013-01-01	19689
2013-04-01	107076
2013-07-01	134203
2013-10-01	227472
2014-01-01	52006
2014-04-01	293049
2014-07-01	226553
2014-10-01	61436
2015-01-01	232072
2015-04-01	241989
2015-07-01	55868
2015-10-01	-53867
2016-01-01	218975
2016-04-01	273566
2016-07-01	228820
2016-10-01	92563
2017-01-01	329162
2017-04-01	312912
2017-07-01	325661
2017-10-01	243544
2018-01-01	301979
2018-04-01	272252