The information requested is given in the following table.
The non-sanction detections that contribute to the overall detection rate have fallen in recent years reflecting a significant shift by many police forces away from recording detections of crime where no further action is taken. For this reason overall detection rates over time are not fully comparable. From 1 April 2007 the rules governing recording of non-sanction detections were revised to reduce the scope within which they can be claimed to a very limited set of circumstances.
Police force area 1997 1998-991 1999-20002 2000-01 2001-02 2002-03 2003-04 2004-05 2005-06 2006-07 Avon and Somerset 26 24 22 21 14 15 15 17 23 24 Bedfordshire 35 33 25 27 25 26 23 28 25 22 British Transport Police n/a n/a n/a n/a n/a 15 16 17 20 24 Cambridgeshire 27 29 25 24 22 22 23 23 27 25 Cheshire 36 37 31 30 26 26 27 26 27 27 Cleveland 25 23 22 21 20 23 21 24 30 31 Cumbria 40 44 39 34 32 31 32 30 35 36 Derbyshire 25 31 28 26 25 26 25 28 27 26 Devon and Cornwall 32 36 35 34 32 29 29 30 28 27 Dorset 29 31 26 25 27 25 26 28 30 30 Durham 31 33 32 34 33 34 29 29 27 30 Dyfed-Powys 61 69 65 63 64 68 47 43 45 45 Essex 27 29 30 26 26 27 28 27 31 33 Gloucestershire 24 31 31 32 30 29 28 27 32 33 Greater Manchester 20 25 23 22 21 22 22 23 25 25 Gwent 51 55 53 57 55 48 45 42 36 33 Hampshire 30 35 32 29 29 30 27 28 24 23 Hertfordshire 32 34 27 24 24 23 25 29 26 29 Humberside 20 22 19 21 20 20 19 20 23 25 Kent 31 34 33 28 28 28 25 23 26 26 Lancashire 29 34 29 27 26 27 27 30 32 35 Leicestershire 34 34 30 28 28 27 22 25 30 28 Lincolnshire 48 40 28 25 27 23 22 25 26 28 London, City of 26 33 32 27 34 36 33 36 43 39 Merseyside 31 31 26 28 24 25 27 30 28 29 Metropolitan Police 26 22 16 15 14 14 15 21 24 21 Norfolk 37 37 30 26 25 24 26 28 31 30 Northamptonshire 35 33 33 33 31 28 28 29 25 26 Northumbria 26 30 31 31 31 31 30 29 35 40 North Wales 34 43 36 31 28 29 33 42 43 48 North Yorkshire 26 33 31 30 26 26 28 35 35 33 Nottinghamshire 28 25 21 20 18 16 18 20 22 23 South Wales 36 39 31 31 33 29 29 29 26 25 South Yorkshire 29 32 25 25 23 21 24 26 27 26 Staffordshire 35 32 22 23 20 31 33 35 35 35 Suffolk 37 41 36 35 33 34 33 32 30 31 Surrey 33 40 32 28 25 22 22 26 25 30 Sussex 26 25 25 23 25 24 24 25 30 31 Thames Valley 24 25 20 22 24 25 23 26 28 25 Warwickshire 27 26 22 22 25 26 25 27 25 27 West Mercia 28 34 29 28 28 33 31 34 34 34 West Midlands 24 30 27 28 29 26 25 23 26 27 West Yorkshire 27 27 25 23 19 20 20 25 28 29 Wiltshire 32 38 33 29 30 28 28 29 32 26 England and Wales 28 29 25 24 22 24 23 26 27 27 n/a = not available 1 The number of crimes detected in that financial year using the expanded coverage and revised counting rules which came into effect on 1 April 1998. 2 New instructions which clarified the rules for detecting crime were introduced on 1 April 1999. Note: It should be noted that non-sanction detections that contribute to the overall detection rate have fallen in recent years reflecting a significant shift by many police forces away from recording detections of crime where no further action is taken. For this reason overall detection rates over time are not fully comparable. From 1 April 2007 the rules governing recording of non-sanction detections were revised to reduce the scope within which they can be claimed to a very limited set of circumstances.