From 0.17% to 10% or More (GNU/Linux in Dominica)
Victim of hurricane Hugo, Portsmouth, Dominica
Dominica is an island with about 73,000 people in an area roughly the size of central+Greater Manchester.
Dominica isn't well known, but it does seem to have embraced Chromebooks in recent years. Did enough people get fed up with Windows?
This month's data (ODF) looks good for ChromeOS and GNU/Linux:
Take that, Microsoft. █