Question: when did immigrants stop coming to ellis island
[{'answer': '1954', 'provenance': [{'wikipedia_id': '9806', 'title': 'Ellis Island', 'start_paragraph_id': 1, 'start_character': 256, 'end_paragraph_id': 1, 'end_character': 260, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]