Question: what is the population of rock hill south carolina
[{'answer': '72,937', 'provenance': [{'wikipedia_id': '134715', 'title': 'Rock Hill, South Carolina', 'start_paragraph_id': 1, 'start_character': 370, 'end_paragraph_id': 1, 'end_character': 376, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]