Question: when did the oakland raiders become the los angeles raiders
[{'answer': '1994', 'provenance': [{'wikipedia_id': '49105514', 'title': 'History of the Los Angeles Raiders', 'start_paragraph_id': 1, 'start_character': 147, 'end_paragraph_id': 1, 'end_character': 151, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49105514', 'title': 'History of the Los Angeles Raiders', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 200, 'bleu_score': 0.640317247616346, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15439950240617604541}, 'section': 'Section::::Abstract.'}]}]