Quarter	Millions of US Dollars
2001-01-01	18
2001-04-01	17
2001-07-01	18
2001-10-01	18
2002-01-01	17
2002-04-01	20
2002-07-01	20
2002-10-01	21
2003-01-01	22
2003-04-01	23
2003-07-01	23
2003-10-01	25
2004-01-01	24
2004-04-01	24
2004-07-01	25
2004-10-01	27
2005-01-01	26
2005-04-01	24
2005-07-01	24
2005-10-01	24
2006-01-01	24
2006-04-01	25
2006-07-01	25
2006-10-01	26
2007-01-01	27
2007-04-01	27
2007-07-01	28
2007-10-01	29
2008-01-01	32
2008-04-01	32
2008-07-01	29
2008-10-01	28
2009-01-01	27
2009-04-01	28
2009-07-01	29
2009-10-01	29
2010-01-01	27
2010-04-01	25
2010-07-01	27
2010-10-01	27