Question: when did the showcase showdown start on the price is right
[{'answer': '1975', 'provenance': [{'wikipedia_id': '37032', 'title': 'The Price Is Right (American game show)', 'start_paragraph_id': 9, 'start_character': 1107, 'end_paragraph_id': 9, 'end_character': 1111, 'bleu_score': 1.0, 'section': 'Section::::Gameplay.:Pricing games.\n'}]}, {'provenance': [{'wikipedia_id': '37032', 'title': 'The Price Is Right (American game show)', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 490, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3907962213197315922}, 'section': 'Section::::Gameplay.:Showcase Showdown.\n'}]}]