"The average number of drug addicts in prison has been fairly stable over an extended period of time. On 1 October 2012, 56% of the women and 62% of the men in prison were drug dependent, alcohol included."
Swedish National Institute of Public Health. "2013 National Report (2012 data) to the EMCDDA by the Reitox National Focal Point: Sweden: New Developments, Trends and in-depth information on selected issues." Östersund: Swedish National Institute of Public Health, 2013, p. 88.