Question: when did the pac 8 become pac 10
[{'answer': '1978', 'provenance': [{'wikipedia_id': '78455', 'title': 'Pac-12 Conference', 'start_paragraph_id': 45, 'start_character': 3, 'end_paragraph_id': 45, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::History.:Pacific-10.\n'}]}, {'provenance': [{'wikipedia_id': '78455', 'title': 'Pac-12 Conference', 'start_paragraph_id': 45, 'start_character': 0, 'end_paragraph_id': 45, 'end_character': 251, 'bleu_score': 0.7807005679501381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15443519635616767919}, 'section': 'Section::::History.:Pacific-10.\n'}]}]