Question: when did the casio calculator watch come out
[{'answer': '1970s', 'provenance': [{'wikipedia_id': '2867523', 'title': 'Calculator watch', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2867523', 'title': 'Calculator watch', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 354, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2414418493895564201}, 'section': 'Section::::Abstract.'}]}]