p>The numbers indicate the extent to which communities deposit their output at arXiv.org, rather than absolute measures of research output. The graphic also illustrates the growing adoption by research communities that did not necessarily employ a formal prior paper preprint distribution system, as did HEP. The incoming rate for 2021 was composed of roughly 37.4% <a href="#phys_yearly">physics</a>, 33.6% <a href="#cs_yearly">cs</a>, and 19.6% <a href="#math_yearly">math</a>. (2017 was the first year that th