Question: when did australia change from the imperial to the metric system of measurement
[{'answer': 'began in 1966', 'provenance': [{'wikipedia_id': '2732143', 'title': 'Metrication in Australia', 'start_paragraph_id': 1, 'start_character': 37, 'end_paragraph_id': 1, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2732143', 'title': 'Metrication in Australia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12064666436427909331}, 'section': 'Section::::Abstract.'}]}]