Question: when did tv go from analog to digital
[{'answer': 'June 12 , 2009', 'provenance': [{'wikipedia_id': '18581669', 'title': 'Digital television transition in the United States', 'start_paragraph_id': 73, 'start_character': 115, 'end_paragraph_id': 73, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Extension of transition to June 12.:DTV Delay Act.\n'}]}, {'provenance': [{'wikipedia_id': '18581669', 'title': 'Digital television transition in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 560, 'bleu_score': 0.7089513887597261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11368827613216251742}, 'section': 'Section::::Abstract.'}]}]