Question: when were residential schools first established in canada
[{'answer': 'the 1820s', 'provenance': [{'wikipedia_id': '949755', 'title': 'Canadian Indian residential school system', 'start_paragraph_id': 8, 'start_character': 175, 'end_paragraph_id': 8, 'end_character': 184, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '949755', 'title': 'Canadian Indian residential school system', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 661, 'bleu_score': 0.979896933041101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8257376508248111017}, 'section': 'Section::::History.\n'}]}]