Year Sterling 1997-12-31 44347 1998-12-31 50437 1999-12-31 58166 2000-12-31 72877 2001-12-31 89706 2002-12-31 109960 2003-12-31 125199 2004-12-31 148825 2005-12-31 174199 2006-12-31 206171 2007-12-31 239746 2008-12-31 292991 2009-12-31 288737 2010-12-31 263288 2011-12-31 211356 2012-12-31 196376 2013-12-31 167492 2014-12-31 152503 2015-12-31 166285 2016-12-31 171590 2017-12-31 169877 2018-12-31 181118 2019-12-31 188465 2020-12-31 197232 2021-12-31 201572 2022-12-31 206978 2023-12-31 212389