Year Severity rate 2022 0.09 2021 0.09 2020 0.09 2019 0.09 2018 0.09 2017 0.09 2016 0.1 2015 0.07 2014 0.09 2013 0.1 2012 0.1 2011 0.11 2010 0.09 2009 0.09 2008 0.1 2007 0.11 2006 0.12 2005 0.12 2004 0.12 2003 0.12 2002 0.12 2001 0.13 2000 0.18 1999 0.14 1998 0.14 1997 0.16 1996 0.16 1995 0.19 1994 0.2 1993 0.18 1992 0.15 1991 0.17 1990 0.18 1989 0.2 1988 0.2 1987 0.2 1986 0.22 1985 0.29 1984 0.34 1983 0.3 1982 0.32 1981 0.37 1980 0.32 1979 0.36 1978 0.35 1977 0.42 1976 0.36 1975 0.43 1974 0.45 1973 0.64 1972 0.72 1971 0.73 1970 0.88 1969 0.9 1968 1 1967 1.02 1966 1.13 1965 1.3 1964 1.25 1963 1.54

Note: 1) Due to the addition of "medical care and welfare" to the surveyed industries from 2008, the surveyed industries are not the same as those before 2007. Caution is needed in comparisons.
Note: 2) Due to the addition of "agriculture" in "agriculture and forestry" to the surveyed industries from 2011, the surveyed industries are not the same as those before 2010. Caution is needed in comparisons.
Note: 3) Due to the addition of "fisheries" to the surveyed industries from 2018, the surveyed industries are not the same as those before 2017. Caution is needed in comparisons.

Severity rate is expressed in terms of the number of workdays lost per 1,000 work-hours in the aggregate.
It indicates the degree of seriousness of the accident, calculated by the following formula :

Data sources: Survey on Industrial Accidents, Wage and Labour Welfare Statistics Office, Ministry of Health, Labour and Welfare, Japan
https://www.mhlw.go.jp/toukei/itiran/roudou/saigai/22/ (Japanese only)
https://www.mhlw.go.jp/english/database/db-l/industrial_accidents.html (English explanation, MHLW)