Year Sterling 1997-12-31 41231 1998-12-31 46247 1999-12-31 52711 2000-12-31 60348 2001-12-31 63558 2002-12-31 70989 2003-12-31 76731 2004-12-31 82820 2005-12-31 96900 2006-12-31 113658 2007-12-31 123626 2008-12-31 121623 2009-12-31 128596 2010-12-31 131867 2011-12-31 113654 2012-12-31 120227 2013-12-31 125871 2014-12-31 134038 2015-12-31 149758 2016-12-31 161726 2017-12-31 177270 2018-12-31 188812 2019-12-31 190388 2020-12-31 227984 2021-12-31 246698 2022-12-31 249521 2023-12-31 233488