Quarter Sterling (millions) 2004-03-31 60.9 2004-06-30 61.2 2004-09-30 65.4 2004-12-31 64.1 2005-03-31 64.2 2005-06-30 63.3 2005-09-30 62 2005-12-31 60 2006-03-31 58.4 2006-06-30 59.9 2006-09-30 59.6 2006-12-31 61.7 2007-03-31 60.8 2007-06-30 61.9 2007-09-30 60.9 2007-12-31 61.2 2008-03-31 64.1 2008-06-30 57.4 2008-09-30 58.8 2008-12-31 57.4 2009-03-31 56.2 2009-06-30 53.3 2009-09-30 55.5 2009-12-31 51.2 2010-03-31 57.4 2010-06-30 56.4 2010-09-30 62.1 2010-12-31 61.7 2011-03-31 63 2011-06-30 61.4 2011-09-30 61.7 2011-12-31 58.5 2012-03-31 56.9 2012-06-30 58.4 2012-09-30 58.6 2012-12-31 57 2013-03-31 61.8 2013-06-30 64.8 2013-09-30 70.6 2013-12-31 68.4 2014-03-31 71.6 2014-06-30 70.8 2014-09-30 72.6 2014-12-31 71.9 2015-03-31 74.3 2015-06-30 74.8 2015-09-30 73.4 2015-12-31 74.3 2016-03-31 87.6 2016-06-30 86.9 2016-09-30 86.7 2016-12-31 84.5 2017-03-31 84.9 2017-06-30 80.9 2017-09-30 79.7 2017-12-31 79 2018-03-31 76.7 2018-06-30 78.4 2018-09-30 80.4 2018-12-31 81.3 2019-03-31 80.8 2019-06-30 79.8 2019-09-30 80.7 2019-12-31 80.5 2020-03-31 80.2 2020-06-30 62.5 2020-09-30 76.4 2020-12-31 75.5 2021-03-31 79.3 2021-06-30 81.4 2021-09-30 80.1 2021-12-31 78 2022-03-31 79 2022-06-30 78.2 2022-09-30 77.8 2022-12-31 79 2023-03-31 78.6 2023-06-30 78.1 2023-09-30 78.3 2023-12-31 78.4