Year Sterling (millions) 1997-12-31 6402 1998-12-31 6499 1999-12-31 6870 2000-12-31 6934 2001-12-31 7350 2002-12-31 8020 2003-12-31 8586 2004-12-31 10327 2005-12-31 12729 2006-12-31 15854 2007-12-31 19233 2008-12-31 21475 2009-12-31 22084 2010-12-31 22529 2011-12-31 21373 2012-12-31 21727 2013-12-31 20740 2014-12-31 19873 2015-12-31 19960 2016-12-31 19866 2017-12-31 19902 2018-12-31 20070 2019-12-31 20060 2020-12-31 21363 2021-12-31 20331 2022-12-31 19752 2023-12-31 19401