Question: when was the last time the vikings won the nfc championship game
[{'answer': '1969', 'provenance': [{'wikipedia_id': '20134', 'title': 'Minnesota Vikings', 'start_paragraph_id': 2, 'start_character': 172, 'end_paragraph_id': 2, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20134', 'title': 'Minnesota Vikings', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 746, 'bleu_score': 0.9678713199044161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10780134138304174351}, 'section': 'Section::::History.\n'}]}]