Question: when did bradford park avenue leave the football league
[{'answer': '1970', 'provenance': [{'wikipedia_id': '14531662', 'title': 'List of Bradford (Park Avenue) A.F.C. seasons', 'start_paragraph_id': 2, 'start_character': 802, 'end_paragraph_id': 2, 'end_character': 806, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14531662', 'title': 'List of Bradford (Park Avenue) A.F.C. seasons', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 900, 'bleu_score': 0.9090339845312471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9698363966294575011}, 'section': 'Section::::Abstract.'}]}]