Question: when did how i met your mother first air
[{'answer': 'September 19 , 2005'}, {'provenance': [{'wikipedia_id': '2711314', 'title': 'How I Met Your Mother', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 348, 'bleu_score': 0.7653884298239191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5420290495200163394}, 'section': 'Section::::Abstract.'}]}]