Year Sterling 1997-12-31 122729 1998-12-31 123712 1999-12-31 113149 2000-12-31 147247 2001-12-31 173380 2002-12-31 159081 2003-12-31 177197 2004-12-31 191077 2005-12-31 259683 2006-12-31 349446 2007-12-31 439855 2008-12-31 647181 2009-12-31 700405 2010-12-31 804871 2011-12-31 696583 2012-12-31 630492 2013-12-31 568803 2014-12-31 448950 2015-12-31 391424 2016-12-31 422900 2017-12-31 420632 2018-12-31 435632 2019-12-31 392567 2020-12-31 422434 2021-12-31 418908 2022-12-31 419305 2023-12-31 442446