Quarter Sterling (millions) 2010-03-31 0 2010-06-30 -1 2010-09-30 0 2010-12-31 0 2011-03-31 0 2011-06-30 1 2011-09-30 0 2011-12-31 0 2012-03-31 0 2012-06-30 2 2012-09-30 6 2012-12-31 0 2013-03-31 13 2013-06-30 -3 2013-09-30 9 2013-12-31 0 2014-03-31 15 2014-06-30 -20 2014-09-30 0 2014-12-31 0 2015-03-31 -9 2015-06-30 0 2015-09-30 0 2015-12-31 -14 2016-03-31 0 2016-06-30 0 2016-09-30 0 2016-12-31 0 2017-03-31 0 2017-06-30 2 2017-09-30 -2 2017-12-31 0 2018-03-31 0 2018-06-30 0 2018-09-30 0 2018-12-31 0 2019-03-31 0 2019-06-30 0 2019-09-30 0 2019-12-31 0 2020-03-31 0 2020-06-30 0 2020-09-30 0 2020-12-31 0 2021-03-31 0 2021-06-30 0 2021-09-30 0 2021-12-31 0 2022-03-31 0 2022-06-30 0 2022-09-30 0 2022-12-31 0 2023-03-31 0 2023-06-30 0 2023-09-30 0 2023-12-31 0