Quarter	Millions of US Dollars
1972-07-01	20
1972-10-01	20
1973-01-01	20
1973-04-01	20
1973-07-01	20
1973-10-01	20
1974-01-01	20
1974-04-01	20
1974-07-01	20
1974-10-01	20
1975-01-01	20
1975-04-01	22
1975-07-01	22
1975-10-01	22
1976-01-01	22
1976-04-01	22
1976-07-01	22
1976-10-01	22
1977-01-01	22
1977-04-01	22
1977-07-01	22
1977-10-01	22
1978-01-01	22
1978-04-01	22
1978-07-01	22
1978-10-01	22
1979-01-01	22
1979-04-01	22
1979-07-01	22
1979-10-01	22
1980-01-01	22
1980-04-01	22
1980-07-01	22
1980-10-01	22
1981-01-01	22
1981-04-01	22
1981-07-01	22
1981-10-01	22
1982-01-01	22
1982-04-01	22
1982-07-01	2
1982-10-01	2
1983-01-01	2
1983-04-01	2
1983-07-01	2
1983-10-01	2
1984-01-01	2
1984-04-01	2
1984-07-01	2
1984-10-01	2
1985-01-01	2
1985-04-01	2
1985-07-01	2
1985-10-01	2
1986-01-01	2
1986-04-01	2
1986-07-01	108
1986-10-01	108
1987-01-01	108
1987-04-01	105
1987-07-01	105
1987-10-01	105
1988-01-01	105
1988-04-01	105
1988-07-01	105
1988-10-01	105
1989-01-01	105
1989-04-01	105
1989-07-01	105
1989-10-01	105
1990-01-01	105
1990-04-01	105
1990-07-01	105
1990-10-01	105
1991-01-01	105
1991-04-01	105
1991-07-01	105
1991-10-01	105
1992-01-01	105
1992-04-01	105
1992-07-01	105
1992-10-01	105
1993-01-01	105
1993-04-01	105
1993-07-01	105
1993-10-01	105
1994-01-01	105
1994-04-01	105
1994-07-01	105
1994-10-01	105
1995-01-01	105
1995-04-01	105
1995-07-01	105
1995-10-01	105
1996-01-01	105
1996-04-01	105
1996-10-01	600
1997-01-01	600
1997-04-01	675
1997-07-01	875
1997-10-01	1300
1998-01-01	1300
1998-04-01	1372
1998-07-01	1759
1998-10-01	1773
1999-01-01	2269
1999-04-01	2268
1999-07-01	2280
1999-10-01	2883
2000-01-01	3232
2000-04-01	3355
2000-07-01	3790
2000-10-01	3901
2001-01-01	3880
2001-04-01	4470
2001-07-01	4493
2001-10-01	4476
2002-01-01	4472
2002-04-01	4519
2002-07-01	4413
2002-10-01	4434
2003-01-01	4496
2003-04-01	4541
2003-07-01	4555
2003-10-01	4587
2004-01-01	4848
2004-04-01	4766
2004-07-01	4688
2004-10-01	4856
2005-01-01	4483
2005-04-01	4328
2005-07-01	4050
2005-10-01	4039
2006-01-01	5441
2006-04-01	5517
2006-07-01	5515
2006-10-01	5181
2007-01-01	5087
2007-04-01	5088
2007-07-01	4692
2007-10-01	4473
2008-01-01	4739
2008-04-01	6738
2008-07-01	6736
2008-10-01	6744
2009-01-01	6729
2009-04-01	6737
2009-07-01	6747
2009-10-01	6143
2010-01-01	6143
2010-04-01	6645
2010-07-01	6482
2010-10-01	6594
2011-01-01	6450
2011-04-01	5857
2011-07-01	5847
2011-10-01	10842
2012-01-01	11422
2012-04-01	11412
2012-07-01	11416
2012-10-01	13914
2013-01-01	12910
2013-04-01	11227
2013-07-01	11535
2013-10-01	9432
2014-01-01	9433
2014-04-01	9438
2014-07-01	9412
2014-10-01	12692
2015-01-01	12799
2015-04-01	12810
2015-07-01	12802
2015-10-01	16516
2016-01-01	16450
2016-04-01	16455
2016-07-01	16756
2016-10-01	15752
2017-01-01	15571
2017-04-01	15658
2017-07-01	15631
2017-10-01	15637
2018-01-01	16385
2018-04-01	15996