Quarter	Millions of US Dollars
1981-10-01	25
1982-01-01	25
1982-04-01	25
1982-07-01	25
1982-10-01	25
1983-01-01	25
1983-04-01	25
1983-07-01	25
1983-10-01	25
1984-01-01	25
1984-04-01	25
1984-07-01	25
1984-10-01	25
1985-01-01	25
1985-04-01	25
1985-07-01	25
1985-10-01	25
1986-01-01	25
1986-04-01	25
1986-07-01	25
1994-01-01	71
1994-04-01	111
1994-07-01	111
1994-10-01	136
1995-01-01	136
1995-04-01	111
1995-07-01	111
1995-10-01	128
1996-01-01	120
1996-04-01	106
1996-07-01	98
1996-10-01	98
1997-01-01	4946
1997-04-01	4970
1997-07-01	4970
1997-10-01	4970
1998-01-01	4959
1998-04-01	4973
1998-07-01	4969
1998-10-01	4379
1999-01-01	4355
1999-04-01	4345
1999-07-01	4335
1999-10-01	4334
2000-01-01	4334
2000-04-01	4334
2000-07-01	4334
2000-10-01	4330
2001-01-01	4330
2001-04-01	4330
2001-07-01	4330
2001-10-01	4330
2002-01-01	5070
2002-04-01	5002
2002-07-01	5002
2002-10-01	4584
2003-01-01	5316
2003-04-01	5316
2003-07-01	5279
2003-10-01	4869
2004-01-01	4869
2004-04-01	5369
2004-07-01	5369
2004-10-01	6254
2005-01-01	6545
2005-04-01	6488
2005-07-01	7235
2005-10-01	7999
2006-01-01	8119
2006-04-01	8159
2006-07-01	8368
2006-10-01	9155
2007-01-01	10582
2007-04-01	10786
2007-07-01	11890
2007-10-01	12150
2008-01-01	10942
2008-04-01	10800
2008-07-01	10853
2008-10-01	10589
2009-01-01	11542
2009-04-01	11682
2009-07-01	12834
2009-10-01	13391
2010-01-01	13693
2010-04-01	14607
2010-07-01	15498
2010-10-01	18507
2011-01-01	19325
2011-04-01	19402
2011-07-01	19985
2011-10-01	20689
2012-01-01	23965
2012-04-01	25808
2012-07-01	26878
2012-10-01	26992
2013-01-01	28769
2013-04-01	30325
2013-07-01	30327
2013-10-01	30986
2014-01-01	32269
2014-04-01	32948
2014-07-01	34193
2014-10-01	37963
2015-01-01	38902
2015-04-01	39444
2015-07-01	41359
2015-10-01	42077
2016-01-01	42597
2016-04-01	41410
2016-07-01	40915
2016-10-01	42832
2017-01-01	42619
2017-04-01	46323
2017-07-01	45967
2017-10-01	46709
2018-01-01	46088
2018-04-01	45384