The information collected by the JICOSH , the former international center of JISHA, is available here, though it has not been updated:
(Note) Japanese Governmental Postal Services Agency became to private Japan Post in 2003. Accidents of government officers are not counted but private officer are counted in accidents reports. Accidents of telecommunication industry suddenly increased because of that governmental restructure. Therefore, telecommunication industry are not included in above figures.
Data source: https://www.jisha.or.jp/english/statistics/pdf/2021e130201.pdf
(Ref) Analysis of fatal & non-fatal accidents in tertiary industry in Japan in 1999-2021