Question: when did willy wonka and the chocolate factory debut
[{'answer': 'June 30 , 1971', 'provenance': [{'wikipedia_id': '174560', 'title': 'Willy Wonka & the Chocolate Factory', 'start_paragraph_id': 27, 'start_character': 30, 'end_paragraph_id': 27, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Reception.\n'}]}]