Question: when did immigrants stop going through ellis island
[{'answer': 'November 12 , 1954', 'provenance': [{'wikipedia_id': '9806', 'title': 'Ellis Island', 'start_paragraph_id': 46, 'start_character': 511, 'end_paragraph_id': 46, 'end_character': 529, 'bleu_score': 1.0, 'section': 'Section::::History.:Second immigration station.:Conversion to detention center.\n'}]}]