Year Sterling 1997-12-31 71920 1998-12-31 77526 1999-12-31 87636 2000-12-31 108913 2001-12-31 131233 2002-12-31 151747 2003-12-31 170782 2004-12-31 196919 2005-12-31 231335 2006-12-31 272051 2007-12-31 317599 2008-12-31 373089 2009-12-31 359495 2010-12-31 327901 2011-12-31 265200 2012-12-31 247301 2013-12-31 226249 2014-12-31 215954 2015-12-31 232223 2016-12-31 246497 2017-12-31 245624 2018-12-31 261532 2019-12-31 265181 2020-12-31 282931 2021-12-31 284851 2022-12-31 292620 2023-12-31 294713