| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 4.06595 |
| 2021 | 4.09065 |
| 2020 | 4.09866 |
| 2019 | 4.09814 |
| 2018 | 4.10269 |
| 2017 | 4.11831 |
| 2016 | 4.15278 |
| 2015 | 4.21252 |
| 2014 | 4.27288 |
| 2013 | 4.31809 |
| 2012 | 4.35583 |
| 2011 | 4.38178 |
| 2010 | 4.39131 |
| 2009 | 4.41062 |
| 2008 | 4.4323 |
| 2007 | 4.43635 |
| 2006 | 4.44466 |
| 2005 | 4.45565 |
| 2004 | 4.46976 |
| 2003 | 4.52233 |
| 2002 | 4.62014 |
| 2001 | 4.72268 |
| 2000 | 4.85038 |
| 1999 | 5.00608 |
| 1998 | 5.1459 |
| 1997 | 5.26297 |
| 1996 | 5.3804 |
| 1995 | 5.50958 |
| 1994 | 5.65398 |
| 1993 | 5.82931 |
| 1992 | 6.0436 |
| 1991 | 6.29929 |
| 1990 | 6.58498 |
| 1989 | 6.90221 |
| 1988 | 7.24464 |
| 1987 | 7.54567 |
| 1986 | 7.752 |
| 1985 | 7.84984 |
| 1984 | 7.82837 |
| 1983 | 7.71402 |
| 1982 | 7.61684 |
| 1981 | 7.38926 |
| 1980 | 7.17015 |
| 1979 | 7.13526 |
| 1978 | 7.07919 |
| 1977 | 6.96389 |
| 1976 | 7.00477 |
| 1975 | 7.07139 |
| 1974 | 7.00001 |
| 1973 | 7.00242 |
| 1972 | 7.02421 |
| 1971 | 7.07784 |
| 1970 | 7.20703 |
| 1969 | 7.36962 |
| 1968 | 7.56793 |
| 1967 | 7.89188 |
| 1966 | 8.31242 |
| 1965 | 8.79913 |
| 1964 | 9.52126 |
| 1963 | 10.4048 |
| 1962 | 11.1803 |
| 1961 | 11.4735 |
| 1960 | 11.2281 |