Question: what time period is rock of ages set in
[{'answer': '1987', 'provenance': [{'wikipedia_id': '31306385', 'title': 'Rock of Ages (2012 film)', 'start_paragraph_id': 4, 'start_character': 3, 'end_paragraph_id': 4, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]