Year Sterling (millions) 1998-12-31 16 1999-12-31 17 2000-12-31 32 2001-12-31 22 2002-12-31 24 2003-12-31 11 2004-12-31 17 2005-12-31 15 2006-12-31 17 2007-12-31 24 2008-12-31 18 2009-12-31 19 2010-12-31 17 2011-12-31 30 2012-12-31 17