Over the years the city has been home to people of various ethnicities, resulting in a range of different traditions and cultural practices. In one decade, the population increased from 427,045 in 1991 to 671,805 in 2001. The population was projected to reach 915,071 in 2011 and 1,319,597 by 2021. To keep up this population growth, the KMC-controlled area of  has expanded to  in 2001. With this new area, the population density which was 85 in 1991 is still 85 in 2001; it is likely to jump to 111 in 2011 and 161 in 2021.

Question: How many people did the population increase by between 1991 and 2001?
Answer: 244760

Question: How many years would it take from 1991 for the population to increase to 1319597, according to projections?
Answer: 30

Question: Which year is projected to show the greatest increase in population from 10 years prior?
Answer: 2021

Question: How many more people populated the city in 2001 than in 1991?
Answer: 244760

Question: Which two years had the same population density?
Answer: 85 in 1991