Year Sterling (millions) 2011-12-31 9744 2012-12-31 9896 2013-12-31 11025 2014-12-31 13983 2015-12-31 12538 2016-12-31 13378 2017-12-31 14960 2018-12-31 13937 2019-12-31 15668 2020-12-31 22148 2021-12-31 22675 2022-12-31 22618 2023-12-31 23615