Question: when did the salary cap start in the nba
[{'answer': '1984 -- 85 season'}, {'provenance': [{'wikipedia_id': '3280233', 'title': 'NBA salary cap', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 511, 'bleu_score': 0.9415674898824081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16972911902230873981}, 'section': 'Section::::History.\n'}]}]