Year Sterling (millions) 2011-12-31 23876 2012-12-31 22529 2013-12-31 22901 2014-12-31 20045 2015-12-31 24325 2016-12-31 17437 2017-12-31 12897 2018-12-31 12752 2019-12-31 14392 2020-12-31 14573 2021-12-31 14576 2022-12-31 22247 2023-12-31 24080