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The source does not provide an exact publication date. The date given here is the day of data access.
The source states that the total score of the rankings is a sum of the quantity, quality, and business environment individual scores.

Quantity Score: Takes into account different metrics, such as number of startups, number of coworking spaces, and number of accelerators, to establish the activity level of the startup ecosystem

Quality Score: Studies parameters that indicate qualitative results achieved by the ecosystem. These parameters include analyzing the traction of the ecosystem’s top startups, as well as reviewing “special entities” the ecosystem has produced: Unicorns, Exits, and Pantheon

Business Score: It is a mix of business and economic indicators at the national level, discounted for cities that haven't reached a critical mass either for Quantity or Quality