Question: when did the castle of good hope became a national monument
[{'answer': '1936', 'provenance': [{'wikipedia_id': '3865017', 'title': 'Castle of Good Hope', 'start_paragraph_id': 1, 'start_character': 261, 'end_paragraph_id': 1, 'end_character': 265, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3865017', 'title': 'Castle of Good Hope', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 463, 'bleu_score': 0.8319145655117071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9602919107244784887}, 'section': 'Section::::Abstract.'}]}]