Question: when did blue man group start in chicago
[{'answer': '1997', 'provenance': [{'wikipedia_id': '417016', 'title': 'Blue Man Group', 'start_paragraph_id': 19, 'start_character': 49, 'end_paragraph_id': 19, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Theatrical productions.:Current theatrical productions.\n'}]}]