The information collected by the JICOSH , the former international center of JISHA, is available here, though it has not been updated:
This picture does not include Covid-19 cases.
Blue lines in 2020-2022 include Covid-19 cases.
Orange lines in 2020-2022 do not include Covid-19 cases.
Orange lines in 2020-2022 include Covid-19 cases.
Blue lines in 2020-2022 do not include Covid-19 cases.
Source:same as Fig 1
Severity rate in Japan (1963-2022)
This picture does not include Covid-19 cases.