Question: when was capital gains tax introduced in the uk
[{'answer': '1965', 'provenance': [{'wikipedia_id': '505878', 'title': 'Capital gains tax', 'start_paragraph_id': 236, 'start_character': 386, 'end_paragraph_id': 236, 'end_character': 390, 'bleu_score': 1.0, 'section': 'Section::::United Kingdom.:History.\n'}]}, {'provenance': [{'wikipedia_id': '505878', 'title': 'Capital gains tax', 'start_paragraph_id': 236, 'start_character': 0, 'end_paragraph_id': 236, 'end_character': 390, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2940480509933471001}, 'section': 'Section::::United Kingdom.:History.\n'}]}]