Question: when is the last time the tigers won a world series
[{'answer': '1984', 'provenance': [{'wikipedia_id': '8579', 'title': 'Detroit Tigers', 'start_paragraph_id': 1, 'start_character': 597, 'end_paragraph_id': 1, 'end_character': 601, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8579', 'title': 'Detroit Tigers', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 853, 'bleu_score': 0.75583274026429, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6228560093309802428}, 'section': 'Section::::Abstract.'}]}]