Question: when was the diary of a wimpy kid published
[{'answer': 'April 1 , 2007', 'provenance': [{'wikipedia_id': '11263766', 'title': 'Diary of a Wimpy Kid', 'start_paragraph_id': 2, 'start_character': 145, 'end_paragraph_id': 2, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]