Question: when was the name bombay officially changed to mumbai
[{'answer': '1995', 'provenance': [{'wikipedia_id': '850010', 'title': 'Renaming of cities in India', 'start_paragraph_id': 29, 'start_character': 49, 'end_paragraph_id': 29, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Important examples.:Cities.\n'}]}]