The growing reference section of geomorphology articles

What is the mean of number of references in a geomorphology journal? Are reference sections growing (as the number of papers published increases)? I have previously looked at reference section size changes in JGR-ES and in length restricted articles (i.e., GRL and Geology), but I am extending the analysis to the four geomorphology journals I commonly read: Geomorphology, Earth Surface Processes and LandformsEarth Surface Dynamics, and  Journal of Geophysical Research – Earth Surface.

You can see below that the mean reference section size is growing at a rate of ~2 additional references per year:

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