Well, the graph wasn't tailor made for this debate. It was for the purposes of a study, which for its purposes only looked at North American cities. I suppose there is a variety of reasons - data was taken from the American Transit Association, which only publishes ridership in North American Cities.
It's also somewhat difficult to compare Calgary, which is about 110 years old to European cities that are centuries old. Totally different history and urban structure, and LRT systems are quite different.
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