| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 8.045 |
| 2021 | 8.133 |
| 2020 | 8.218 |
| 2019 | 8.302 |
| 2018 | 8.384 |
| 2017 | 8.465 |
| 2016 | 8.543 |
| 2015 | 8.619 |
| 2014 | 8.696 |
| 2013 | 8.774 |
| 2012 | 8.852 |
| 2011 | 8.931 |
| 2010 | 9.188 |
| 2009 | 10.011 |
| 2008 | 10.897 |
| 2007 | 11.854 |
| 2006 | 12.882 |
| 2005 | 14.022 |
| 2004 | 15.36 |
| 2003 | 16.804 |
| 2002 | 18.353 |
| 2001 | 20.01 |
| 2000 | 21.351 |
| 1999 | 21.477 |
| 1998 | 21.602 |
| 1997 | 21.728 |
| 1996 | 21.855 |
| 1995 | 21.984 |
| 1994 | 22.119 |
| 1993 | 22.254 |
| 1992 | 22.39 |
| 1991 | 22.527 |
| 1990 | 22.661 |
| 1989 | 22.787 |
| 1988 | 22.912 |
| 1987 | 23.038 |
| 1986 | 23.165 |
| 1985 | 23.288 |
| 1984 | 23.397 |
| 1983 | 23.507 |
| 1982 | 23.617 |
| 1981 | 23.727 |
| 1980 | 23.825 |
| 1979 | 23.882 |
| 1978 | 23.94 |
| 1977 | 23.998 |
| 1976 | 24.056 |
| 1975 | 24.284 |
| 1974 | 25.025 |
| 1973 | 25.78 |
| 1972 | 26.548 |
| 1971 | 27.334 |
| 1970 | 28.123 |
| 1969 | 28.898 |
| 1968 | 29.684 |
| 1967 | 30.484 |
| 1966 | 31.296 |
| 1965 | 32.134 |
| 1964 | 33.028 |
| 1963 | 33.936 |
| 1962 | 34.856 |
| 1961 | 35.787 |
| 1960 | 36.728 |