Question: when did louisiana became a right to work state
[{'answer': '1976', 'provenance': [{'wikipedia_id': '392198', 'title': 'Right-to-work law', 'start_paragraph_id': 67, 'start_character': 31, 'end_paragraph_id': 67, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::U.S. states with right-to-work laws.\n'}]}]