vertical scale we have points on the development index up to 250 points. the red column on the far right, goes up to 250 points. this is because the biggest city in the world up to the year 2000 was tokyo. according to a source i chose to use. the economist pocket book in figures. that assured me in the how to tokyo had 27-point. billion residents. it's the biggest city in the history of the year. so, 250-points, but 26.7 million people, means that 106,800 people would score you one point. new york city, in the year 2000, had 16.7 million people. so you divide that by 106,800 which consecutive gives you the blue column. that was easy, my score for the year 2000, because the answers were there for me nene economist world and figures. go back to very back into the past. how about the year 1900? in that year some debate among historians but most agree london was the biggest city in the world. london had about 6.6 million people roughly in the year 1900. divide that again by 106,800, and in 1900, the western core scored 61.8 points. biggest city in the east in 1900 is tokyo again, 1.75 million people. divide by 106,800 people. tokyo scores 16.37 p