Question: how many states have passed convention of the states
[{'answer': '12', 'provenance': [{'wikipedia_id': '2210111', 'title': 'Convention to propose amendments to the United States Constitution', 'start_paragraph_id': 37, 'start_character': 422, 'end_paragraph_id': 37, 'end_character': 424, 'bleu_score': 1.0, 'section': 'Section::::Attempts to call an Article V convention.\n'}]}, {'provenance': [{'wikipedia_id': '2210111', 'title': 'Convention to propose amendments to the United States Constitution', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 664, 'bleu_score': 0.8833369827816521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7813996733096921374}, 'section': 'Section::::Abstract.'}]}]