Question: when did voyager 2 leave our solar system
[{'answer': 'August 30 , 2007', 'provenance': [{'wikipedia_id': '32782', 'title': 'Voyager 2', 'start_paragraph_id': 47, 'start_character': 3, 'end_paragraph_id': 47, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Interstellar mission.\n'}]}, {'provenance': [{'wikipedia_id': '32782', 'title': 'Voyager 2', 'start_paragraph_id': 47, 'start_character': 0, 'end_paragraph_id': 47, 'end_character': 325, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16182475188228878160}, 'section': 'Section::::Interstellar mission.\n'}]}]