Methodology:

The org manual has been introduced around d330eed7c (2017-12)

#+begin_src bash
git log main --grep manual --format=%ci > manual-commits.dat
cat manual-commits.dat | awk '{print $1}' | cut -d- -f1,2 > manual-commits-month.dat 
#+end_src

#+begin_src gnuplot
set timefmt '%Y-%m'
set xdata time
set title "Number of commits according to \"git log --grep manual\"" font ",20"
set tics out
set label 1 ".texi → .org" at "2017-12",155 center font ",18" textcolor rgb'red'
set arrow from "2017-12",0 to "2017-12",150 nohead front lw 10 lc rgb'red'
set style fill solid 0.5 border
set yrange [0:160]
plot 'manual-commits-month.dat' u 1:(1.0) bins=40 w boxes t''
#+end_src

-- 
Ihor Radchenko,
Org mode contributor,
Learn more about Org mode at https://orgmode.org/.
Support Org development at https://liberapay.com/org-mode,
or support my work at https://liberapay.com/yantar92