The percentage value represents the number of ferns (and lycophytes) in the country divided by the number of ferns in the world, 12,768

The Köppen classification depends on average monthly values of temperature and precipitation
The most commonly used form of the Köppen classification has five primary types labeled A to E
The primary types are A, tropical; B, dry; C, mild mid-latitude; D, cold mid-latitude; and E, polar
The five primary classifications can be further divided into secondary classifications such as rain forest, monsoon, tropical savanna, humid subtropical, humid continental, oceanic climate, Mediterranean climate, steppe, subarctic climate, tundra, polar ice cap, and desert

This table shows the fern count for all the countries that have at least 1% of the total fern count

Data from Hassler, Michael (2004 – 2020): World Plants. Synonymic Checklist and Distribution of the World Flora. Version 11.1; last update Dec. 8, 2020. – www.worldplants.de