Question: when is blue planet 2 on tv in usa
[{'answer': 'successive Saturdays', 'provenance': [{'wikipedia_id': '53265861', 'title': 'Blue Planet II', 'start_paragraph_id': 3, 'start_character': 194, 'end_paragraph_id': 3, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Saturday , January 20 , 2018'}, {'provenance': [{'wikipedia_id': '53265861', 'title': 'Blue Planet II', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 229, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9896354227146954757}, 'section': 'Section::::Abstract.'}]}]