Just 11% of sexual offences reported to Gardaí in 2018 have resulted in someone being charged.
The CSO has published new figures which show that sex crimes have the lowest detection rates.
Detection rates for crimes reported in 2018 vary, depending on the type of crime.
— Central Statistics Office Ireland (@CSOIreland) December 3, 2019
A crime is considered 'detected' when a suspect has been identified and proceedings have commenced.
Drug offences had the highest detection rates last year, at 85%.
This is the first time the CSO has published crime data since suspending the practice two years ago over concerns it had with the quality of data coming from Gardaí.
The data collection system has since been restructured, which Deputy Commissioner John Twomey hopes will give victims confidence in the Gardaí.
The report also found that recorded crime rates per head of population were higher in Dublin than anywhere else in the country.