There have been 67 deaths in Irish prisons between 2010 and 2017 according to figures released under the Freedom of Information Act 2014.
A high of 14 people died in 2015 while 2012 and 2016 saw the lowest figure since the turn of the decade with just five fatalities. Last year nine inmates died, which was an increase on the previous year.
In 2010, a total of eleven people died which then dropped by five the following year. Nine people died in 2013.
The most common form of death was misadventure, with sixteen deaths categorised in that way.
Fourteen people died from natural causes, while the same amount of people died from suicide. A high of three people took their own lives 2013, while a record four died from natural causes in 2015.
There was one confirmed unlawful killing in 2015, while there are ongoing inquests in relation to twelve incidents since 2010. There are seven active inquests from last year, while two inquests from 2013 are still ongoing.