Adoption of Apple’s OS X 10.11, aka El Capitan, continues to lag behind its two predecessors, new data released this week showed.

One measurement put El Capitan‘s uptake at just 75% of its forerunner, 2014’s Yosemite, according to statistics from U.S.-based analytics vendor Net Applications.

In the 153 days between its Sept. 30, 2015 launch and Feb. 29, 2016, El Capitan’s user share of all OS X editions grew to 47.9%, or approximately 0.31 percentage points per day. On a per-day basis — from its Oct. 16, 2014, debut until Feb. 28, 2015 — Yosemite accumulated an average of 0.4 percentage points of growth.

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