The graphs compare the growth of urban population in nine cities in 1950 to 2015 is the number of fastest grow to each of those cities. It can be clearly seen that Tokyo-Japan has the fastest growth city and London-England has the slowest growing city.
In 1950 there were around 5 million or less in largos Nigeria, Cairo Egypt, Mexico city Mexico, Bombay India and Sao Paolo Brazil and 5 million and above from London England, shanghai china and Tokyo Japan. But in 1970 there were around less than 10 million from London, Cairo, Mexico city, Lagos, Bombay and Sao Polo, more than 10 million of urban from Network, shanghai and Tokyo. In 2000there were fewer than 15 million in London, Cairo, and Lagos and shanghai but a rise to more than 15 million in New York, Mexico City, Bombay, Sao Paolo and Tokyo. In 2015 there will be less than 20 million in London, Cairo and shanghai. Finally the biggest growth is more than 20 million from Lagos, Bombay, Sao Paolo and Tokyo.
In conclusion it is clear that Tokyo is the fastest growing city in the world and London is the slowest growing city in the chart.