Quarter	Millions of US Dollars
1995-10-01	150
1996-01-01	150
1996-04-01	150
1996-07-01	150
1996-10-01	150
1997-01-01	150
1997-04-01	150
1997-07-01	150
1997-10-01	150
1998-01-01	150
1998-04-01	150
1998-07-01	150
1998-10-01	150
1999-01-01	150
1999-04-01	150
1999-07-01	150
1999-10-01	150
2000-01-01	150
2000-04-01	150
2000-07-01	150
2005-10-01	10
2006-01-01	10
2006-04-01	27
2006-07-01	107
2006-10-01	157
2007-01-01	327
2007-04-01	393
2007-07-01	543
2007-10-01	825
2008-01-01	989
2008-04-01	938
2008-07-01	739
2008-10-01	723
2009-01-01	603
2009-04-01	619
2009-07-01	632
2009-10-01	649
2010-01-01	490
2010-04-01	440
2010-07-01	483
2010-10-01	478
2011-01-01	364
2011-04-01	347
2011-07-01	339
2011-10-01	319
2012-01-01	322
2012-04-01	285
2012-07-01	299
2012-10-01	189
2013-01-01	189
2013-04-01	189
2013-07-01	314
2013-10-01	314
2014-01-01	253
2014-04-01	249
2014-07-01	235
2014-10-01	1062
2015-01-01	1041
2015-04-01	1050
2015-07-01	1027
2015-10-01	1026
2016-01-01	1033
2016-04-01	1025
2016-07-01	1522
2016-10-01	1514
2017-01-01	1640
2017-04-01	1562
2017-07-01	1569
2017-10-01	1563
2018-01-01	1560
2018-04-01	1545