Question: when were the common core state standards developed
[{'answer': '2009', 'provenance': [{'wikipedia_id': '27684253', 'title': 'Common Core State Standards Initiative', 'start_paragraph_id': 6, 'start_character': 3, 'end_paragraph_id': 6, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}, {'provenance': [{'wikipedia_id': '27684253', 'title': 'Common Core State Standards Initiative', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 804, 'bleu_score': 0.9851290761715561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8355027565563002265}, 'section': 'Section::::Development.\n'}]}]