Question: when did the new horizons mission reach pluto
[{'answer': 'July 14 , 2015', 'provenance': [{'wikipedia_id': '390905', 'title': 'New Horizons', 'start_paragraph_id': 131, 'start_character': 69, 'end_paragraph_id': 131, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Pluto system encounter.:Flyby details.\n'}]}, {'provenance': [{'wikipedia_id': '390905', 'title': 'New Horizons', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 501, 'bleu_score': 0.665233174128938, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10039331469980209176}, 'section': 'Section::::Abstract.'}]}]