Question: when was the song oh christmas tree written
[{'answer': '1824', 'provenance': [{'wikipedia_id': '1242322', 'title': 'O Tannenbaum', 'start_paragraph_id': 3, 'start_character': 34, 'end_paragraph_id': 3, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '1242322', 'title': 'O Tannenbaum', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 311, 'bleu_score': 0.913499617140693, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8600018265316105500}, 'section': 'Section::::History.\n'}]}]