Question: when was the last time simon & garfunkel performed together
[{'answer': '2010', 'provenance': [{'wikipedia_id': '26823', 'title': 'Simon & Garfunkel', 'start_paragraph_id': 42, 'start_character': 362, 'end_paragraph_id': 42, 'end_character': 366, 'bleu_score': 1.0, 'section': 'Section::::History.:Awards and final tour (1990–present).\n'}]}]