Question: when did celtic fans start singing you'll never walk alone
[{'answer': '1966', 'provenance': [{'wikipedia_id': '284977', 'title': "You'll Never Walk Alone", 'start_paragraph_id': 22, 'start_character': 53, 'end_paragraph_id': 22, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Sporting anthem.:Other teams.\n'}]}]