Conversely defendants who may have been given hospital orders, or indeterminate jail sentences - given to dangerous offenders with no fixed length of time before they were abolished in 2012 - may not have been released if deemed unsuitable by the Parole Board.
Here are some of the shocking cases the figures include.
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1. The faces of the perpetrators in 12 of the cases where killers are due for release in the next decade
The faces of the perpetrators in 12 of the cases where killers are due for release in the next decade
2. Keith Peel, Michael Casey and David Carroll
The three men were jailed for life for the “savage and brutal” murder of dad-of-three David Splatt, 35, who was kicked in the head and dumped in a brook to drown in Ribbleton, Preston,
Peel, 27, of Fir Trees Avenue, Grange, admitted murder. Casey, 19, also of Fir Trees Avenue, and his cousin Carroll, 21, of Burholme Close, Ribbleton, were found guilty of murder following a trial.
Peel, who has previous convictions for violence got life with a minimum term of 18 years and four months, while Carroll was locked up for a minimum of 18 years and Casey for a minimum of 16 years, meaning all three could be out in the next 10 years.
3. Lauren Coyle and Reece Hitchcott
Coyle and her ex-partner Hitchcott strapped a toddler face down in a "monstrous cage bed" causing her death from asphyxiation and were each sentenced to 10 years in youth custody in 2018.
Coyle's daughter Ellie-May Minshull-Coyle was 19 months old when she died after being restrained in Preston in March 2017.
She had been bound by her legs and chest and forced to sleep face-down in the bed, with a duvet placed over her which meant she had no way to regulate her temperature while she was restrained. She succumbed to asphyxiation.
They were both convicted of causing or allowing her death.
4. James Bellass
Bellass, of Holland House Court in Walton-le-Dale, near Preston, killed his girlfriend, popular beautician Jillinda 'Jilly' Fisher, 26, in her flat above Sybaris beauty salon in The Green, Eccleston, near Chorley.
Bellas - who was 6ft tall, 16 stone, and abused steroids - was enraged she was late replying to a text message and at a reference to an STD he had contracted. He headbutted Jillinda before strangling her, and fell asleep by her body.
In 2008 he was jailed for life with a minimum of 17 years.