Question: how many buick grand national gnx were made
[{'answer': '547', 'provenance': [{'wikipedia_id': '720221', 'title': 'Buick Regal', 'start_paragraph_id': 24, 'start_character': 65, 'end_paragraph_id': 24, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::Second generation (1978–1987).:Grand National, Turbo-T, T-Type, and GNX.\n'}]}, {'provenance': [{'wikipedia_id': '720221', 'title': 'Buick Regal', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 1608, 'bleu_score': 0.643145931789673, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14562548027612223643}, 'section': 'Section::::Second generation (1978–1987).:Grand National, Turbo-T, T-Type, and GNX.\n'}]}]