| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 7.4356 |
| 2021 | 7.53579 |
| 2020 | 7.26211 |
| 2019 | 6.82786 |
| 2018 | 6.36784 |
| 2017 | 5.95822 |
| 2016 | 5.82701 |
| 2015 | 5.96306 |
| 2014 | 5.9713 |
| 2013 | 5.79561 |
| 2012 | 5.60642 |
| 2011 | 5.43488 |
| 2010 | 5.30162 |
| 2009 | 5.25316 |
| 2008 | 5.24658 |
| 2007 | 5.19173 |
| 2006 | 5.07739 |
| 2005 | 4.94483 |
| 2004 | 4.82569 |
| 2003 | 4.71517 |
| 2002 | 4.60639 |
| 2001 | 4.5016 |
| 2000 | 4.38803 |
| 1999 | 4.24195 |
| 1998 | 4.04512 |
| 1997 | 3.7973 |
| 1996 | 3.51338 |
| 1995 | 3.24571 |
| 1994 | 3.01499 |
| 1993 | 2.82784 |
| 1992 | 2.70972 |
| 1991 | 2.6491 |
| 1990 | 2.60625 |
| 1989 | 2.59081 |
| 1988 | 2.61033 |
| 1987 | 2.62095 |
| 1986 | 2.60996 |
| 1985 | 2.58453 |
| 1984 | 2.5497 |
| 1983 | 2.50648 |
| 1982 | 2.46068 |
| 1981 | 2.3995 |
| 1980 | 2.32745 |
| 1979 | 2.25514 |
| 1978 | 2.19152 |
| 1977 | 2.14206 |
| 1976 | 2.11971 |
| 1975 | 2.11749 |
| 1974 | 2.10509 |
| 1973 | 2.07792 |
| 1972 | 2.03093 |
| 1971 | 1.96831 |
| 1970 | 1.90827 |
| 1969 | 1.86145 |
| 1968 | 1.81188 |
| 1967 | 1.76038 |
| 1966 | 1.7095 |
| 1965 | 1.66425 |
| 1964 | 1.63627 |
| 1963 | 1.61936 |
| 1962 | 1.60087 |
| 1961 | 1.57065 |
| 1960 | 1.53276 |