Question: when did hungary open its borders with austria
[{'answer': '1989', 'provenance': [{'wikipedia_id': '13250011', 'title': "Removal of Hungary's border fence with Austria", 'start_paragraph_id': 1, 'start_character': 63, 'end_paragraph_id': 1, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13250011', 'title': "Removal of Hungary's border fence with Austria", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 524, 'bleu_score': 0.922050490003484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9735153660675873486}, 'section': 'Section::::Abstract.'}]}]