Question: when did joni mitchell wrote both sides now
[{'answer': 'March 1967', 'provenance': [{'wikipedia_id': '6572508', 'title': 'Both Sides, Now', 'start_paragraph_id': 4, 'start_character': 54, 'end_paragraph_id': 4, 'end_character': 64, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '6572508', 'title': 'Both Sides, Now', 'start_paragraph_id': 4, 'start_character': 33, 'end_paragraph_id': 4, 'end_character': 145, 'bleu_score': 0.829360614494932, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13954237840357234972}, 'section': 'Section::::Background.\n'}]}]