Question: when did the lawrence welk show first air
[{'answer': 'May 11 , 1951', 'provenance': [{'wikipedia_id': '782808', 'title': 'The Lawrence Welk Show', 'start_paragraph_id': 3, 'start_character': 3, 'end_paragraph_id': 3, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Broadcast history.\n'}]}, {'provenance': [{'wikipedia_id': '782808', 'title': 'The Lawrence Welk Show', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 330, 'bleu_score': 0.8056390000090431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5884154142190963018}, 'section': 'Section::::Broadcast history.\n'}]}]