Quarter	Millions of US Dollars
1986-04-01	250
1986-07-01	250
1986-10-01	250
1987-01-01	250
1987-04-01	250
1987-07-01	250
1987-10-01	250
1988-01-01	250
1988-04-01	250
1988-07-01	250
1988-10-01	250
1989-01-01	250
1989-04-01	250
1989-07-01	250
1989-10-01	250
1990-01-01	250
1990-04-01	250
1990-07-01	250
1990-10-01	250
1991-01-01	250
1991-04-01	250
1991-07-01	250
1991-10-01	250
1992-01-01	250
1992-04-01	250
1992-07-01	250
1992-10-01	250
1993-01-01	250
1993-04-01	250
1993-07-01	250
1993-10-01	250
1994-01-01	250
1994-04-01	250
1994-07-01	250
1994-10-01	250
1995-01-01	250
1995-04-01	250
1995-07-01	250
1995-10-01	250
1996-01-01	250
1998-07-01	90
1998-10-01	89
1999-01-01	619
1999-04-01	1862
1999-07-01	1898
1999-10-01	2334
2000-01-01	2447
2000-04-01	2448
2000-07-01	2307
2000-10-01	2775
2001-01-01	2672
2001-04-01	3444
2001-07-01	3651
2001-10-01	3550
2002-01-01	3521
2002-04-01	3919
2002-07-01	3882
2002-10-01	4081
2003-01-01	5301
2003-04-01	5523
2003-07-01	6693
2003-10-01	7191
2004-01-01	8207
2004-04-01	8922
2004-07-01	9848
2004-10-01	12164
2005-01-01	14441
2005-04-01	14557
2005-07-01	15142
2005-10-01	14145
2006-01-01	16901
2006-04-01	16865
2006-07-01	17456
2006-10-01	17947
2007-01-01	19423
2007-04-01	19617
2007-07-01	20446
2007-10-01	21222
2008-01-01	22522
2008-04-01	25070
2008-07-01	23080
2008-10-01	22424
2009-01-01	20805
2009-04-01	21621
2009-07-01	23991
2009-10-01	23663
2010-01-01	24332
2010-04-01	22901
2010-07-01	23148
2010-10-01	22822
2011-01-01	27595
2011-04-01	28443
2011-07-01	27340
2011-10-01	25366
2012-01-01	25805
2012-04-01	24975
2012-07-01	24881
2012-10-01	23743
2013-01-01	24575
2013-04-01	24654
2013-07-01	25154
2013-10-01	28683
2014-01-01	30323
2014-04-01	29426
2014-07-01	26113
2014-10-01	25745
2015-01-01	23283
2015-04-01	23657
2015-07-01	23604
2015-10-01	23364
2016-01-01	22941
2016-04-01	22675
2016-07-01	21576
2016-10-01	21169
2017-01-01	21271
2017-04-01	21038
2017-07-01	20072
2017-10-01	21134
2018-01-01	20349
2018-04-01	18223