Question: when was where have all the flowers gone written
[{'answer': '1955', 'provenance': [{'wikipedia_id': '8443279', 'title': 'Where Have All the Flowers Gone?', 'start_paragraph_id': 1, 'start_character': 133, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8443279', 'title': 'Where Have All the Flowers Gone?', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 270, 'bleu_score': 0.597377796774419, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6607919592911269536}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8443279', 'title': 'Where Have All the Flowers Gone?', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['"Where Have All the Flowers Gone?" is a modern folk-style song. The melody and the first three verses were written by Pete Seeger in 1955 and published in "Sing Out!', '"Where Have All the Flowers Gone?" is a modern folk-style song. The melody and the first three verses were written by Pete Seeger in 1955 and published in "Sing Out!" magazine.', '"Where Have All the Flowers Gone?" is a modern folk-style song. The melody and the first three verses were written by Pete Seeger in 1955 and published in "Sing Out!" magazine. Additional verses were added in May 1960 by Joe Hickerson, who turned it into a circular song.']}}]}]