Quarter	Millions of US Dollars
1994-01-01	205
1994-04-01	205
1994-07-01	205
1994-10-01	205
1995-01-01	205
1995-04-01	205
1995-07-01	205
1995-10-01	205
1996-01-01	205
1996-04-01	205
1996-07-01	205
1996-10-01	205
1997-01-01	205
1997-04-01	205
1997-07-01	205
1997-10-01	205
1998-01-01	205
1998-04-01	455
1998-07-01	455
1998-10-01	455
1999-01-01	445
1999-04-01	445
1999-07-01	435
1999-10-01	435
2000-01-01	426
2000-04-01	426
2000-07-01	416
2000-10-01	416
2001-01-01	406
2001-04-01	406
2001-07-01	396
2001-10-01	396
2002-01-01	387
2002-04-01	387
2002-07-01	377
2002-10-01	377
2003-01-01	367
2003-04-01	367
2003-07-01	348
2003-10-01	348
2004-01-01	348
2004-04-01	348
2004-07-01	338
2004-10-01	338
2005-01-01	328
2005-04-01	328
2005-07-01	318
2005-10-01	318
2006-01-01	309
2006-04-01	309
2006-07-01	309
2006-10-01	299
2007-01-01	299
2007-04-01	289
2007-07-01	279
2007-10-01	279
2008-01-01	270
2008-04-01	270
2008-07-01	260
2008-10-01	260
2009-01-01	250
2009-04-01	250
2009-07-01	250
2009-10-01	250
2010-01-01	250
2010-04-01	250
2010-07-01	250
2010-10-01	250
2011-01-01	250
2011-04-01	250
2011-07-01	250
2011-10-01	250
2012-01-01	250
2012-04-01	250
2012-07-01	250
2012-10-01	250
2013-01-01	250
2013-04-01	250
2013-07-01	250
2013-10-01	250
2014-01-01	250
2014-04-01	250
2014-07-01	250
2014-10-01	250
2015-01-01	250
2015-04-01	250
2015-07-01	250
2015-10-01	250
2016-01-01	250
2016-04-01	250
2016-07-01	306
2016-10-01	303
2017-01-01	303
2017-04-01	364
2017-07-01	368
2017-10-01	370
2018-01-01	558
2018-04-01	541