I refer the hon. Member to the answer I gave the hon. Members for Epsom and Ewell (Chris Grayling) and for Fareham (Mr. Hoban) on 15 October 2007, Official Report, column 819W.
For previous years, I refer the hon. Member to the answers given by my predecessor the right hon. Tony Blair on 30 November 2006, Official Report, columns 895-96W, and 22 March 2004, Official Report, columns 559-60W.