Question: when did the marco polo app come out
[{'answer': '2014', 'provenance': [{'wikipedia_id': '56280013', 'title': 'Marco Polo (app)', 'start_paragraph_id': 1, 'start_character': 93, 'end_paragraph_id': 1, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56280013', 'title': 'Marco Polo (app)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 239, 'bleu_score': 0.555618670996688, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7907235387592558570}, 'section': 'Section::::Abstract.'}]}]