It's confusing, but if you dig into how Google defines the city/region rankings, you'll see that they're based on percentage of all searches for that city/ranking.
For example, if "car insurance" was searched 200x in London, and the total volume of ALL searches made by people in London was 20,000, then it's 1% of the searches.
Now if "car insurance" was searched 2x in Monaco, but there were only 20 searches of any kind carried out in Monaco, then it's 10% of the searches.
Google Trends would then list the results as follows:-
Monaco
London
Even though the VOLUME of searches for "car insurance" by people in Monaco was only 1% of the volume of searches carried out by people in London.
Same for regions, same for languages. So the only use for that data (that I can see) is to try and spot what people in certain countries or regions find more relevant than other stuff they're looking for. But it gives absolutely no "comparative" data to verify search volumes by country or region.
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