Valve amended the Steam survey for December 2025 - Linux actually hit another all-time high
(www.gamingonlinux.com)
So, from Jan'25 to Dec'25, Linux market share grew from 2.06% to 3.58%. That is about 74% growth: (3.58% - 2.06%) / 2.06% * 100% = 73.786...%
Same numbers for 2024 gives about 17% growth for that year: (2.29% - 1.95%) / 1.95% * 100% = 17.435...%