Year Sterling (millions) 1998-12-31 16 1999-12-31 15 2000-12-31 33 2001-12-31 22 2002-12-31 11 2003-12-31 6 2004-12-31 14 2005-12-31 9 2006-12-31 8 2007-12-31 15 2008-12-31 8 2009-12-31 10 2010-12-31 10 2011-12-31 25 2012-12-31 15