Question: when did pokemon go come out in the us
[{'answer': '2016', 'provenance': [{'wikipedia_id': '47774416', 'title': 'Pokémon Go', 'start_paragraph_id': 1, 'start_character': 227, 'end_paragraph_id': 1, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]