Question: when did princess anne competed in the olympics
[{'answer': '1976', 'provenance': [{'wikipedia_id': '125231', 'title': 'Anne, Princess Royal', 'start_paragraph_id': 19, 'start_character': 407, 'end_paragraph_id': 19, 'end_character': 411, 'bleu_score': 1.0, 'section': 'Section::::Equestrianism.\n'}]}, {'provenance': [{'wikipedia_id': '125231', 'title': 'Anne, Princess Royal', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 779, 'bleu_score': 0.9851290761715561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15980822278366942431}, 'section': 'Section::::Equestrianism.\n'}]}]