How does counting and ranking of the top regions, cities, and languages work, and are they scaled differently?

To rank the top regions, cities, or languages, Google Trends first looks at a sample of all Google searches to determine the areas or languages from which we received the most searches for your first term. Then, for those top cities, Google Trends calculates the ratio of searches for your term coming from each city divided by total Google searches coming from the same city. The city ranking you see on the page and the bar charts alongside each city name both represent this ratio. When cities’ ratios are fairly close together, the corresponding bar graphs will be roughly the same length, and the exact ranking between these cities is less meaningful.
If you export the data to a .csv file, you’ll see numbers for the top regions and cities. These numbers are based on a scale where the top region or city for the search term which you’ve ranked the data by will be 1.0.