Question: when did the nfl adopt a salary cap
[{'answer': 'for the 1994 season', 'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'start_paragraph_id': 39, 'start_character': 29, 'end_paragraph_id': 39, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}, {'answer': '1994', 'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'start_paragraph_id': 39, 'start_character': 37, 'end_paragraph_id': 39, 'end_character': 41, 'bleu_score': 1.0, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}, {'answer': '1994 season', 'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'start_paragraph_id': 39, 'start_character': 37, 'end_paragraph_id': 39, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}, {'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': 2475975995833747475}, 'section': 'Section::::In North American leagues.:National Football League.\n'}]}, {'provenance': [{'wikipedia_id': '364837', 'title': 'Salary cap', 'section': 'Section::::In North American leagues.:National Football League.\n', 'start_paragraph_id': 39, 'end_paragraph_id': 39, 'meta': {'evidence_span': ['The cap was first introduced for the 1994 season and was expected to be $32 million, but an unexpectedly high bid from Fox and other networks increased the cap to $34.6 million.', 'The cap was first introduced for the 1994 season', 'The cap was first introduced for the 1994 season and was expected to be $32 million, but an unexpectedly high bid from Fox and other networks increased the cap to $34.6 million.']}}]}]