Linux marketshare is 5% in nigeria, making it the second most-used os. Also the marketshare for linux has mostly increased in african and asian countries while mostly declining everywhere else

The Water Cooler
1

Could it be that linux is more popular in developing countries?

2

The percentage is meaning less without a statement about the size of the market. What are the market sizes?

The percentage does not tell you the number of installed machines which you need to know when looking at popularity.