Question: when is the last time the celtics went to the finals
[{'answer': '2010', 'provenance': [{'wikipedia_id': '43376', 'title': 'Boston Celtics', 'start_paragraph_id': 2, 'start_character': 319, 'end_paragraph_id': 2, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43376', 'title': 'Boston Celtics', 'start_paragraph_id': 2, 'start_character': 113, 'end_paragraph_id': 2, 'end_character': 648, 'bleu_score': 0.8200080982276641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13518832334205287053}, 'section': 'Section::::Abstract.'}]}]