Question: when was the last time los angeles hosted the olympics
[{'answer': '1984', 'provenance': [{'wikipedia_id': '1337290', 'title': 'Los Angeles Olympics', 'start_paragraph_id': 1, 'start_character': 49, 'end_paragraph_id': 1, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1337290', 'title': 'Los Angeles Olympics', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 57, 'bleu_score': 0.5253819788848311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7832229882808036547}, 'section': 'Section::::1984 Summer Olympics.\n'}]}]