Question: when did salt and shake crisps come out
[{'answer': 'the 1920s', 'provenance': [{'wikipedia_id': '9668225', 'title': "Salt 'n' Shake", 'start_paragraph_id': 2, 'start_character': 120, 'end_paragraph_id': 2, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9668225', 'title': "Salt 'n' Shake", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 355, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10241367253523458606}, 'section': 'Section::::Abstract.'}]}]