[holding answer 17 September 2007]: Detection statistics at police force area level for 2006-07 were published on 20 September 2007. They show a clear up rate of 28 per cent. for Yorkshire and the Humber region and 33 per cent. for North Yorkshire. Changes to the offence coverage in 1998, the detections guidance in 1999 and the introduction of the National Crime Recording Standard in 2002 mean that data for 1997 are not directly comparable with that for 2006-07. In 1997, the clear up rate was 26 per cent. for both Yorkshire and the Humber region and North Yorkshire.