Year Sterling (millions) 2008-12-31 0 2009-12-31 1 2010-12-31 51 2011-12-31 123 2012-12-31 0 2013-12-31 97 2014-12-31 74 2015-12-31 76 2016-12-31 37 2017-12-31 19 2018-12-31 0 2019-12-31 0 2020-12-31 1 2021-12-31 0 2022-12-31 0