Question: when was the salary cap introduced to the nfl
[{'answer': 'the 1994 season', 'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'start_paragraph_id': 39, 'start_character': 33, 'end_paragraph_id': 39, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}, {'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'start_paragraph_id': 39, 'start_character': 119, 'end_paragraph_id': 39, 'end_character': 729, 'bleu_score': 0.8617417339903831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15684687342918397965}, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}]