What statistics does her department have on the (a) number of children at child and youth care centres in each province that are currently receiving treatment for substance abuse, (b) type of treatment the specified children are receiving, (c)(i) ages and (ii) gender, (d) types of substances, including legal and illegal drugs and alcohol, that the children are addicted to, (e) number of children at the specified centres that were successfully rehabilitated over the past five years and (f) other relevant details on children with substance abuse addictions in the centres?