Question: when was central statistical organisation of india established
[{'answer': '2 May 1951', 'provenance': [{'wikipedia_id': '7482932', 'title': 'Central Statistics Office (India)', 'start_paragraph_id': 17, 'start_character': 49, 'end_paragraph_id': 17, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '7482932', 'title': 'Central Statistics Office (India)', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 59, 'bleu_score': 0.850733133512352, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 931842113762386244}, 'section': 'Section::::History.\n'}]}]