The following table shows the average monthly number of prisoners doubled up in cells designed for one and the proportion of the prisoner population this represents. There are no instances of more than two prisoners sharing a cell designed for one. The practice of three prisoners sharing a cell designed for one (trebling) ended in 1994.
Financial year Average monthly doubling1 Proportion of prisoners doubled (percentage) 2003-04 16,363 22.2 2004-05 16,878 22.6 2005-06 16,986 22.2 2006-072 17,974 22.8 1 Figures subject to rounding. 2 Figures for 2006-07 currently provisional.