Conversation so far:
where is delhi located in india outline map
What is the population of Delhi
Delhi has an estimated 2016 population of 18.6 million.
What is the language spoken in Delhi
Hindi is the most commonly spoken language (81%), followed by Punjabi (7%) and Urdu (6%).

Question: What city in the world compares in population growth
Self-contained rewrite: What city  in the world compares to Delhi in regards to population growth