Question: when did norfolk island became part of australia
[{'answer': '1 July 1914', 'provenance': [{'wikipedia_id': '21422', 'title': 'Norfolk Island', 'start_paragraph_id': 23, 'start_character': 250, 'end_paragraph_id': 23, 'end_character': 261, 'bleu_score': 1.0, 'section': 'Section::::History.:Settlement by Pitcairn Islanders (1856present).:20th century.\n'}]}]