To ask the Secretary of State for Education and Skills how many and what percentage of pupils registered at pupil referral units had (a) statemented and (b) unstatemented special educational needs as a result of (i) autistic spectrum disorder, (ii) emotional, behavioural and social difficulties, (iii) hearing impairment, (iv) moderate learning difficulty, (v) multi-sensory impairment, (vi) physical disability, (vii) profound and multiple learning difficulty, (viii) severe learning difficulty, (xix) specific learning difficulty, (x) speech, language and communication needs, (xi) visual impairment and (xii) other or unknown causes in each year since 1997. (133855)