Question: when did the u.s. government recognize pi day as a holiday
[{'answer': '2009', 'provenance': [{'wikipedia_id': '25013', 'title': 'Pi Day', 'start_paragraph_id': 1, 'start_character': 196, 'end_paragraph_id': 1, 'end_character': 200, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25013', 'title': 'Pi Day', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 280, 'bleu_score': 0.7995389546140481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2440674675798067763}, 'section': 'Section::::Abstract.'}]}]