Question: when did joni mitchell wrote big yellow taxi
[{'answer': 'in 1970', 'provenance': [{'wikipedia_id': '2012759', 'title': 'Big Yellow Taxi', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2012759', 'title': 'Big Yellow Taxi', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 606, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16316689769371929495}, 'section': 'Section::::Abstract.'}]}]