column of the table for 2010- 2013 are from an informational report from the Senate on CRAs (No 775 dated 23/07/2014). This report also sets out the number of placements in 2013. The number of placements in 2009 has been corrected here compared with previous editions: the new statement of 30,270 placements given initially as the total for France and its overseas territories (CICI reports for 2009, 2010 and 2011) became in later editions (2011 and 2012) that for Metropolitan France, whilst the previous edition (27,699 placements) became that for French overseas departments. Comments: The CICI annual reports do not show how the average rate of occupation is defined and assessed. By applying this rate to capacity, an estimate of the average numbers of persons present in CRAs should be obtained. However this estimate is unreliable as the capacity may have been given for a fixed date (it would not then be the average capacity for the year). Another estimate of numbers would be possible from this table as placements correspond to entries and average duration of stays has been supplied. A lower estimate is arrived at. For 2013, calculating the occupancy rate gives an average total number of 754 detainees, and a calculation by average stay in detention gives a total number of 795 detainees. These two methods of calculation show an increase in these detainee numbers from 2003 (496 or 432 dependent upon the method of estimating) to 2007 (1,285/1,014) and then a drop to 2011 (811/585). The same calculation showed a slight rise in 2012 (836/703), but the 2013 data showed, depending on the chosen calculation method, a very slight decrease or increase. House arrest, being an alternative to detention introduced in 2011, remains relatively less used: 668 measures in 2012 and 1,258 in 2013 (source: AN impact study of the bill dated 23 July 2014). 134