Question: when did the walking dead comic books come out
[{'answer': '2003', 'provenance': [{'wikipedia_id': '2202814', 'title': 'The Walking Dead (comic book)', 'start_paragraph_id': 2, 'start_character': 16, 'end_paragraph_id': 2, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2202814', 'title': 'The Walking Dead (comic book)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 214, 'bleu_score': 0.793235883248342, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5734898540915203318}, 'section': 'Section::::Abstract.'}]}]