Question: what year did chelsea won the champions league
[{'answer': '2012', 'provenance': [{'wikipedia_id': '21312110', 'title': '2012 UEFA Champions League Final', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21312110', 'title': '2012 UEFA Champions League Final', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 535, 'bleu_score': 0.940298458781994, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14309776344705778565}, 'section': 'Section::::Abstract.'}]}]