Question: when did puerto rican immigrants come to america
[{'answer': 'mid-19th century', 'provenance': [{'wikipedia_id': '4442102', 'title': 'Puerto Ricans in New York City', 'start_paragraph_id': 1, 'start_character': 134, 'end_paragraph_id': 1, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4442102', 'title': 'Puerto Ricans in New York City', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 528, 'bleu_score': 0.9236799386190421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18159612078308963515}, 'section': 'Section::::Abstract.'}]}]