Question: when was the most recent national curriculum published
[{'answer': 'September 2013', 'provenance': [{'wikipedia_id': '1545981', 'title': 'National Curriculum for England', 'start_paragraph_id': 27, 'start_character': 93, 'end_paragraph_id': 27, 'end_character': 107, 'bleu_score': 1.0, 'section': 'Section::::History.:2012-14 Gove reforms.\n'}]}, {'provenance': [{'wikipedia_id': '1545981', 'title': 'National Curriculum for England', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 655, 'bleu_score': 0.947293862318023, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15841415432276988106}, 'section': 'Section::::History.:2012-14 Gove reforms.\n'}]}]