Question: when was corporal punishment banned in schools in canada
[{'answer': '2004', 'provenance': [{'wikipedia_id': '20411847', 'title': 'School corporal punishment', 'start_paragraph_id': 46, 'start_character': 68, 'end_paragraph_id': 46, 'end_character': 72, 'bleu_score': 1.0, 'section': 'Section::::By country.:Canada.\n'}]}, {'provenance': [{'wikipedia_id': '20411847', 'title': 'School corporal punishment', 'start_paragraph_id': 46, 'start_character': 0, 'end_paragraph_id': 46, 'end_character': 612, 'bleu_score': 0.9817332376369081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4026626631663406428}, 'section': 'Section::::By country.:Canada.\n'}]}]