Question: when did pakistan won the last hockey world cup
[{'answer': '1994', 'provenance': [{'wikipedia_id': '951198', 'title': 'Hockey World Cup', 'start_paragraph_id': 25, 'start_character': 275, 'end_paragraph_id': 25, 'end_character': 279, 'bleu_score': 1.0, 'section': 'Section::::Results.:Performance by host nations.\n'}]}]