The change is even more dramatic if you consider only those users who use English as their language in Steam. Also, Linux adoption rate has sped up this year. https://www.gamingonlinux.com/steam-tracker/ collects various data about Steam usage. One of the charts (screenshot below) show Linux market share among Linux/English users and overall Linux market share. I added the red line to demonstrate how I see the growth. There's only few data points this side of the year, so my drawing is most likely wrong, but the growth starts around March. The green line is at 4.8% in January and February and 6.31% in July, so a nice 30% increase within about 6 months among Linux/English users.

EDIT: The post is now more in line with reality. Couple more data points:

• Linux market share among all Steam Linux users has gone from 2.06% in January to 2.89% in July. That's a 40% increase within the first seven months only. And as another commenter said, the growth rate might increase towards the end of the year as more people starts abandoning Windows 10.
• The same numbers for last year are 1.95% in Jan '24 and 2.08% in Jul '24, which is only a 6% increase.
• But because the data is a bit jumpy, if I use approximate values of 1.75% for Jan '24 and 2.05 for Dec '24, the Linux market share increased by 17% in the entire last year.
• I'll stop now.