Question: when was the first sponge bob episode made
[{'answer': 'on July 17 , 1999', 'provenance': [{'wikipedia_id': '2655089', 'title': 'SpongeBob SquarePants', 'start_paragraph_id': 3, 'start_character': 176, 'end_paragraph_id': 3, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2655089', 'title': 'SpongeBob SquarePants', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 529, 'bleu_score': 0.780004140707894, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4758288821717426998}, 'section': 'Section::::Abstract.'}]}]