Question: when did ceylon change its name to sri lanka
[{'answer': '1972', 'provenance': [{'wikipedia_id': '12575013', 'title': 'Dominion of Ceylon', 'start_paragraph_id': 1, 'start_character': 17, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12575013', 'title': 'Dominion of Ceylon', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 0.9087701224825541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17917060198660686657}, 'section': 'Section::::Abstract.'}]}]