Figures in relation to surveillance are published in the annual report of the Chief Surveillance Commissioner, a copy of which is in the House Library. Law enforcement agencies were granted some 16,651 directed surveillance and 350 intrusive authorisations during the period 1 April 2006 to 31 March 2007, the most recent period for which figures are available. Figures for intelligence agency use of these powers are not published in the interests of national security.