Question: when was fluoride added to water in melbourne
[{'answer': '1977', 'provenance': [{'wikipedia_id': '34990231', 'title': 'Water fluoridation in Australia', 'start_paragraph_id': 19, 'start_character': 137, 'end_paragraph_id': 19, 'end_character': 141, 'bleu_score': 1.0, 'section': 'Section::::Victoria.\n'}]}, {'provenance': [{'wikipedia_id': '34990231', 'title': 'Water fluoridation in Australia', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 496, 'bleu_score': 0.9738505480425671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11010645362338446410}, 'section': 'Section::::Victoria.\n'}]}]