| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 4.69632 |
| 2021 | 4.73173 |
| 2020 | 4.79545 |
| 2019 | 4.85953 |
| 2018 | 4.90424 |
| 2017 | 4.93747 |
| 2016 | 4.95839 |
| 2015 | 4.95991 |
| 2014 | 4.96818 |
| 2013 | 4.97948 |
| 2012 | 4.97212 |
| 2011 | 4.96937 |
| 2010 | 4.96938 |
| 2009 | 4.96969 |
| 2008 | 5.00906 |
| 2007 | 5.09962 |
| 2006 | 5.19778 |
| 2005 | 5.32482 |
| 2004 | 5.48379 |
| 2003 | 5.62517 |
| 2002 | 5.73842 |
| 2001 | 5.85035 |
| 2000 | 5.97922 |
| 1999 | 6.1278 |
| 1998 | 6.31056 |
| 1997 | 6.5366 |
| 1996 | 6.8057 |
| 1995 | 7.10311 |
| 1994 | 7.43258 |
| 1993 | 7.78552 |
| 1992 | 8.08822 |
| 1991 | 8.28903 |
| 1990 | 8.372 |
| 1989 | 8.32856 |
| 1988 | 8.19274 |
| 1987 | 8.07355 |
| 1986 | 7.81798 |
| 1985 | 7.56372 |
| 1984 | 7.49258 |
| 1983 | 7.39692 |
| 1982 | 7.24047 |
| 1981 | 7.2414 |
| 1980 | 7.27128 |
| 1979 | 7.16662 |
| 1978 | 7.13095 |
| 1977 | 7.11818 |
| 1976 | 7.14618 |
| 1975 | 7.25926 |
| 1974 | 7.41377 |
| 1973 | 7.60869 |
| 1972 | 7.92389 |
| 1971 | 8.34242 |
| 1970 | 8.82983 |
| 1969 | 9.53748 |
| 1968 | 10.409 |
| 1967 | 11.1981 |
| 1966 | 11.5087 |
| 1965 | 11.2665 |
| 1964 | 10.822 |
| 1963 | 10.3298 |
| 1962 | 9.89655 |
| 1961 | 9.87772 |
| 1960 | 10.2344 |