Fewer people are being charged with stealing vehicles and joyriding in Nottinghamshire, new figures reveal.
The RAC says that across the country thefts are increasing but fewer suspects are being identified, describing it as "the worst possible combination".
Home Office data for 2018 shows 155 out of 2,390 thefts of a motor vehicle resulted in someone being charged or summonsed to court by Nottinghamshire Police – just six percent of cases.
This represents a drop on 2015’s rate, when a suspect faced prosecution in 122 out of 1,234 - or 10 per cent - of cases.
The figures include the lesser offence of an "unauthorised taking", where a criminal takes a vehicle without the owner's permission but without intending to keep it - true in many cases of joyriding.
Over the same period, the proportion of cases where the investigation was closed without a suspect being identified rose from 73 per cent to 80 per cent.
Across England and Wales, around 112,000 crimes under the category of ‘theft or unauthorised taking of a motor vehicle’ were recorded by police forces in 2018.
Of these, about 4,220 resulted in a charge or summons – or around four per cent.
This is less than half the rate in 2015 across all forces, when around 73,100 crimes of this nature were logged in total.
Commenting on the national figures, RAC Insurance spokesman Simon Williams said: “Not only are more vehicles being stolen, fewer suspects are being identified and charged which has to be the worst possible combination.
“Those who have had their cars stolen will no doubt be angered and frustrated by the fact very few of those responsible for these crimes are ever brought to justice.
"As well as the personal stress caused, every theft also contributes to making the cost of car insurance more expensive for everyone who drives."
He added: “The fact we have fewer police officers now than 10 years ago appears to be affecting how many criminals are tracked down.
"Regardless of this, these crimes are almost certainly being committed by sophisticated gangs, meaning that catching just a few could bring the number of thefts down considerably.”
Simon Kempton, operational lead for the Police Federation of England and Wales, said: “It is frustrating to see so many investigations being dropped, but there are now almost 22,000 fewer officers than there were in 2010.
“Our members are trying to meet growing demand with dwindling numbers and we simply cannot do everything we once could, or that the public expect us to do, therefore forces are having to prioritise and be realistic about what they can and can’t investigate until the Government starts to take the service seriously."
Detective Chief SuperintendentGerard Milano, head of crime for Nottinghamshire Police, said: "Every crime is important and every victim gets a service according to threat, risk and harm as well as vulnerability.
"In other areas of acquisitive crime like burglary we have seen increases in prosecutions and reductions in crime volumes.
"We also work with partners on vehicle crime prevention and target hardening and would urge people to ensure their keys are kept securely and valuables are not left on display in vehicles."