The numbers on the graph reflect how many searches have been done for a particular term, relative to the total number of searches done on Google over time. They don’t represent absolute search volume numbers, because the data is normalized and presented on a scale from 0-100. 
 
I’m not entirely sure how they account for language differences, so for the most part this is just fun to look at, I probably wouldn’t put too much stock into it.

Source: Google Trends

Top 15 Countries:

New Zealand
United States
Australia
Canada
United Kingdom
Germany
Puerto Rico
Ireland
Netherlands
Spain
Austria
Singapore
Norway
Sweden
Costa Rica

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