Question: when was free health care introduced in canada
[{'answer': '1984', 'provenance': [{'wikipedia_id': '811741', 'title': 'Healthcare in Canada', 'start_paragraph_id': 1, 'start_character': 177, 'end_paragraph_id': 1, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '811741', 'title': 'Healthcare in Canada', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 181, 'bleu_score': 0.7975010608178971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 594512119478588276}, 'section': 'Section::::Abstract.'}]}]