Quarter	Millions of US Dollars
1972-04-01	25
1972-07-01	25
1972-10-01	25
1973-01-01	28
1973-04-01	52
1973-07-01	53
1973-10-01	47
1974-01-01	50
1974-04-01	50
1974-07-01	49
1974-10-01	53
1975-01-01	55
1975-04-01	54
1975-07-01	48
1975-10-01	49
1976-01-01	50
1976-04-01	49
1976-07-01	52
1976-10-01	54
1977-01-01	54
1977-04-01	54
1977-07-01	98
1977-10-01	107
1978-01-01	112
1978-04-01	183
1978-07-01	196
1978-10-01	251
1979-01-01	311
1979-04-01	308
1979-07-01	366
1979-10-01	356
1980-01-01	323
1980-04-01	339
1980-07-01	338
1980-10-01	330
1981-01-01	312
1981-04-01	286
1981-07-01	287
1981-10-01	305
1982-01-01	589
1982-04-01	575
1982-07-01	563
1982-10-01	898
1983-01-01	952
1983-04-01	1158
1983-07-01	2006
1983-10-01	2064
1984-01-01	2431
1984-04-01	2395
1984-07-01	2512
1984-10-01	3088
1985-01-01	3094
1985-04-01	3952
1985-07-01	4111
1985-10-01	5266
1986-01-01	5403
1986-04-01	5538
1986-07-01	5656
1986-10-01	5717
1987-01-01	5896
1987-04-01	5959
1987-07-01	6040
1987-10-01	6452
1988-01-01	6591
1988-04-01	6033
1988-07-01	6036
1988-10-01	6203
1989-01-01	6156
1989-04-01	5798
1989-07-01	5784
1989-10-01	6012
1990-01-01	5929
1990-04-01	5999
1990-07-01	6405
1990-10-01	6337
1991-01-01	6105
1991-04-01	6233
1991-07-01	6386
1991-10-01	6574
1992-01-01	6274
1992-04-01	6384
1992-07-01	6547
1992-10-01	5249
1993-01-01	5324
1993-04-01	5404
1993-07-01	4231
1993-10-01	3917
1994-01-01	4032
1994-04-01	3462
1994-07-01	3076
1994-10-01	2459
1995-01-01	2647
1995-04-01	2173
1995-07-01	2073
1995-10-01	2044
1996-01-01	2015
1996-04-01	1985
1996-07-01	1976
1996-10-01	1745
1997-01-01	1692
1997-04-01	1646
1997-07-01	1532
1997-10-01	1501
1998-01-01	1038
1998-04-01	1037
1998-07-01	974
1998-10-01	971
1999-01-01	968
1999-04-01	1965
1999-07-01	1970
1999-10-01	1968
2000-01-01	1966
2000-04-01	1960
2000-07-01	2257
2000-10-01	2864
2001-01-01	2828
2001-04-01	2804
2001-07-01	3851
2001-10-01	3828
2002-01-01	4571
2002-04-01	4660
2002-07-01	4655
2002-10-01	4699
2003-01-01	4723
2003-04-01	4763
2003-07-01	4779
2003-10-01	4202
2004-01-01	4178
2004-04-01	4172
2004-07-01	4188
2004-10-01	4276
2005-01-01	4230
2005-04-01	4167
2005-07-01	4161
2005-10-01	3375
2006-01-01	3377
2006-04-01	3384
2006-07-01	3386
2006-10-01	3393
2007-01-01	3393
2007-04-01	3396
2007-07-01	3398
2007-10-01	3396
2008-01-01	3395
2008-04-01	3395
2008-07-01	3382
2008-10-01	3357
2009-01-01	3354
2009-04-01	1871
2009-07-01	1750
2009-10-01	1750
2010-01-01	1750
2010-04-01	3000
2010-07-01	3000
2010-10-01	3000
2011-01-01	3000
2011-04-01	3800
2011-07-01	4050
2011-10-01	4050
2012-01-01	4050
2012-04-01	4050
2012-07-01	4050
2012-10-01	4050
2013-01-01	4050
2013-04-01	4050
2013-07-01	4050
2013-10-01	4525
2014-01-01	4526
2014-04-01	4531
2014-07-01	4520
2014-10-01	4504
2015-01-01	4487
2015-04-01	4746
2015-07-01	4722
2015-10-01	4724
2016-01-01	4746
2016-04-01	6245
2016-07-01	5040
2016-10-01	5015
2017-01-01	5029
2017-04-01	5036
2017-07-01	5042
2017-10-01	5049
2018-01-01	5058
2018-04-01	5040