Question: when was capital gains tax introduced in australia
[{'answer': '20 September 1985', 'provenance': [{'wikipedia_id': '3313446', 'title': 'Capital gains tax in Australia', 'start_paragraph_id': 5, 'start_character': 57, 'end_paragraph_id': 5, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3313446', 'title': 'Capital gains tax in Australia', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 1092, 'bleu_score': 0.9117149211326591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15328139868946868107}, 'section': 'Section::::History.\n'}]}]