Question: when was whose line is it anyway cancelled
[{'answer': 'December 15 , 2007', 'provenance': [{'wikipedia_id': '26239862', 'title': 'Whose Line Is It Anyway? (American TV series)', 'start_paragraph_id': 1, 'start_character': 235, 'end_paragraph_id': 1, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26239862', 'title': 'Whose Line Is It Anyway? (American TV series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 361, 'bleu_score': 0.6116402603533271, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9601805971469384236}, 'section': 'Section::::Abstract.'}]}]