Quarter	Millions of US Dollars
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	0
1998-04-01	0
1998-07-01	0
1998-10-01	0
1999-01-01	11
1999-04-01	11
1999-07-01	13
1999-10-01	13
2001-04-01	0
2001-07-01	0
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	171
2003-07-01	175
2003-10-01	235
2004-01-01	229
2004-04-01	91
2004-07-01	91
2004-10-01	91
2005-01-01	91
2005-04-01	91
2005-07-01	91
2005-10-01	239
2006-01-01	243
2006-04-01	250
2006-07-01	250
2006-10-01	249
2007-01-01	251
2007-04-01	208
2007-07-01	216