Question: when was the sydney harbour bridge paid off
[{'answer': '1988', 'provenance': [{'wikipedia_id': '28267', 'title': 'Sydney Harbour Bridge', 'start_paragraph_id': 44, 'start_character': 97, 'end_paragraph_id': 44, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction.\n'}]}, {'provenance': [{'wikipedia_id': '28267', 'title': 'Sydney Harbour Bridge', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 101, 'bleu_score': 0.6907573115737, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14837852498363352499}, 'section': 'Section::::History.:Construction.\n'}]}]