Year Sterling (millions) 2011-12-31 8325 2012-12-31 8929 2013-12-31 9048 2014-12-31 10529 2015-12-31 11915 2016-12-31 13652 2017-12-31 14421 2018-12-31 15486 2019-12-31 16056 2020-12-31 21996 2021-12-31 21354 2022-12-31 21883 2023-12-31 22461