Question: when was delhi designated the national capital territory
[{'answer': '1991', 'provenance': [{'wikipedia_id': '37756', 'title': 'Delhi', 'start_paragraph_id': 29, 'start_character': 46, 'end_paragraph_id': 29, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::History.:Post-Independence.\n'}]}, {'provenance': [{'wikipedia_id': '37756', 'title': 'Delhi', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 247, 'bleu_score': 0.5553847131313181, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4734566211232222840}, 'section': 'Section::::History.:Post-Independence.\n'}]}]