List of various sites that track the percentage of Linux users publicly.
Sources that track the usage globally, or across wide range of users, multiple countries, demographics etc.
To be honest, these stats seem somewhat unreliable and flaky, there are fluctuations that don't make any sense.
Can filter by country.
https://gs.statcounter.com/os-market-share/desktop/worldwide
For 12 months date range it sometimes takes a few seconds for the chart to show up.
Can filter by country. Can also tick Bot class→Likely human, then the userbase share drops for Linux...
https://radar.cloudflare.com/explorer?dataSet=http&groupBy=os&filters=deviceType%253DDesktop&dt=52w
Only European countries. Can only show one country at a time. Need to select "PC" upon opening the page (button not visible on small screen size).
Note: Unix in families differs from Linux in types (despite sharing similar month-to-month or week-to-week difference), it's unclear why. Maybe ChromeOS?
https://ranking.gemius.com/ranking/systems/
Biases: only gamer demographic, only a random(?) sample of whole userbase asked for survey consent monthly. The selected group sample can skew the results a lot (for example an uptick in Chinese Simplified users always means a drop in Linux usershare).
Official: https://store.steampowered.com/hwsurvey/ (expand OS Version)
GamingOnLinux.com's Steam Linux Data Tracker: https://www.gamingonlinux.com/steam-tracker/
This might be small trackers, such as public stats of a singular site or application.
Note: Ubuntu shown separately for some reason. ChromeOS separately which is good.
https://plausible.io/plausible.io/operating-systems?f=is%2Cscreen%2CDesktop
Let me know in the comments if you know of more.