Question: when did the working income tax benefit start
[{'answer': '2007', 'provenance': [{'wikipedia_id': '47931775', 'title': 'Working income tax benefit', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47931775', 'title': 'Working income tax benefit', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 328, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12627821759420516649}, 'section': 'Section::::Abstract.'}]}]