Question: when did the bank of england start quantitative easing
[{'answer': 'March 2009', 'provenance': [{'wikipedia_id': '7235622', 'title': 'Quantitative easing', 'start_paragraph_id': 23, 'start_character': 241, 'end_paragraph_id': 23, 'end_character': 251, 'bleu_score': 1.0, 'section': 'Section::::History.:After 2007.:US QE1, QE2, and QE3.\n'}]}, {'provenance': [{'wikipedia_id': '7235622', 'title': 'Quantitative easing', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 1376, 'bleu_score': 0.991649086558349, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 21353994122657739}, 'section': 'Section::::History.:After 2007.:United Kingdom.\n'}]}]