Question: when was lead based paint banned in canada
[{'answer': '1976', 'provenance': [{'wikipedia_id': '1970496', 'title': 'Lead paint', 'start_paragraph_id': 13, 'start_character': 78, 'end_paragraph_id': 13, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Regulation.\n'}]}, {'provenance': [{'wikipedia_id': '1970496', 'title': 'Lead paint', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 952, 'bleu_score': 0.9861583350689591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14095585591360208512}, 'section': 'Section::::Regulation.\n'}]}]