Question: when was the first phineas and ferb episode made
[{'answer': 'August 17 , 2007', 'provenance': [{'wikipedia_id': '12819036', 'title': 'List of Phineas and Ferb episodes', 'start_paragraph_id': 1, 'start_character': 111, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12819036', 'title': 'List of Phineas and Ferb episodes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 203, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11619270565517514000}, 'section': 'Section::::Abstract.'}]}]