Question: when did the big ten championship game start
[{'answer': '2011', 'provenance': [{'wikipedia_id': '28272857', 'title': 'Big Ten Football Championship Game', 'start_paragraph_id': 1, 'start_character': 121, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28272857', 'title': 'Big Ten Football Championship Game', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 396, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18420626059737238053}, 'section': 'Section::::Abstract.'}]}]