Question: when was the last time there were 2 ties in the nfl
[{'answer': '2016', 'provenance': [{'wikipedia_id': '2766942', 'title': 'List of NFL tied games', 'start_paragraph_id': 4, 'start_character': 233, 'end_paragraph_id': 4, 'end_character': 237, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1997', 'provenance': [{'wikipedia_id': '2766942', 'title': 'List of NFL tied games', 'start_paragraph_id': 4, 'start_character': 227, 'end_paragraph_id': 4, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2766942', 'title': 'List of NFL tied games', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 869, 'bleu_score': 0.9643179313983421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12476691416448557593}, 'section': 'Section::::Abstract.'}]}]