Question: when was the first hockey world cup held
[{'answer': '1971', 'provenance': [{'wikipedia_id': '951198', 'title': 'Hockey World Cup', 'start_paragraph_id': 1, 'start_character': 158, 'end_paragraph_id': 1, 'end_character': 162, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '951198', 'title': 'Hockey World Cup', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 244, 'bleu_score': 0.9493253852526031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7516646330628859878}, 'section': 'Section::::Abstract.'}]}]