Quarter Sterling (millions) 2004-03-31 19.2 2004-06-30 20 2004-09-30 19.6 2004-12-31 18.3 2005-03-31 17.4 2005-06-30 14.6 2005-09-30 12.5 2005-12-31 14.8 2006-03-31 16.1 2006-06-30 15 2006-09-30 13.9 2006-12-31 13.3 2007-03-31 14.8 2007-06-30 13.3 2007-09-30 13.4 2007-12-31 13.7 2008-03-31 12.4 2008-06-30 11.7 2008-09-30 11.7 2008-12-31 11.7 2009-03-31 12.1 2009-06-30 13.4 2009-09-30 13.2 2009-12-31 13.5 2010-03-31 17.7 2010-06-30 19 2010-09-30 19 2010-12-31 19.6 2011-03-31 19.5 2011-06-30 19.7 2011-09-30 20.4 2011-12-31 20.3 2012-03-31 20.4 2012-06-30 21.1 2012-09-30 21.4 2012-12-31 21.5 2013-03-31 22.3 2013-06-30 23.7 2013-09-30 24 2013-12-31 23.5 2014-03-31 23.3 2014-06-30 24.4 2014-09-30 24.7 2014-12-31 25 2015-03-31 25.9 2015-06-30 25.2 2015-09-30 25.5 2015-12-31 25.6