Question: when was if i had a hammer written
[{'answer': '1949', 'provenance': [{'wikipedia_id': '2301865', 'title': 'If I Had a Hammer', 'start_paragraph_id': 1, 'start_character': 103, 'end_paragraph_id': 1, 'end_character': 107, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2301865', 'title': 'If I Had a Hammer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 397, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10798119893324530937}, 'section': 'Section::::Abstract.'}]}]