| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 5.79905 |
| 2021 | 5.74193 |
| 2020 | 5.75107 |
| 2019 | 5.78533 |
| 2018 | 5.83324 |
| 2017 | 5.96789 |
| 2016 | 6.1916 |
| 2015 | 6.46692 |
| 2014 | 6.89522 |
| 2013 | 7.44499 |
| 2012 | 7.92015 |
| 2011 | 8.04132 |
| 2010 | 7.76454 |
| 2009 | 7.352 |
| 2008 | 6.93708 |
| 2007 | 6.58438 |
| 2006 | 6.52682 |
| 2005 | 6.72777 |
| 2004 | 6.75934 |
| 2003 | 6.58042 |
| 2002 | 6.39508 |
| 2001 | 6.23841 |
| 2000 | 6.13816 |
| 1999 | 6.14738 |
| 1998 | 6.20748 |
| 1997 | 6.21871 |
| 1996 | 6.1656 |
| 1995 | 6.07487 |
| 1994 | 5.98318 |
| 1993 | 5.89542 |
| 1992 | 5.79821 |
| 1991 | 5.70586 |
| 1990 | 5.62319 |
| 1989 | 5.52867 |
| 1988 | 5.41344 |
| 1987 | 5.28509 |
| 1986 | 5.1313 |
| 1985 | 4.98319 |
| 1984 | 4.82595 |
| 1983 | 4.63904 |
| 1982 | 4.47497 |
| 1981 | 4.35363 |
| 1980 | 4.24016 |
| 1979 | 4.17521 |
| 1978 | 4.17843 |
| 1977 | 4.18372 |
| 1976 | 4.17206 |
| 1975 | 4.14024 |
| 1974 | 4.10029 |
| 1973 | 4.05297 |
| 1972 | 3.98899 |
| 1971 | 3.88068 |
| 1970 | 3.75566 |
| 1969 | 3.63645 |
| 1968 | 3.53055 |
| 1967 | 3.46253 |
| 1966 | 3.44254 |
| 1965 | 3.44889 |
| 1964 | 3.43274 |
| 1963 | 3.39141 |
| 1962 | 3.32267 |
| 1961 | 3.23456 |
| 1960 | 3.1531 |