| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 5.34382 |
| 2021 | 5.41029 |
| 2020 | 5.49134 |
| 2019 | 5.59314 |
| 2018 | 5.7267 |
| 2017 | 5.8954 |
| 2016 | 6.10154 |
| 2015 | 6.33588 |
| 2014 | 6.59814 |
| 2013 | 6.87986 |
| 2012 | 7.11934 |
| 2011 | 7.26891 |
| 2010 | 7.31734 |
| 2009 | 7.25901 |
| 2008 | 7.12189 |
| 2007 | 7.00618 |
| 2006 | 6.77499 |
| 2005 | 6.5349 |
| 2004 | 6.45107 |
| 2003 | 6.34804 |
| 2002 | 6.18201 |
| 2001 | 6.14968 |
| 2000 | 6.1573 |
| 1999 | 6.0464 |
| 1998 | 5.98665 |
| 1997 | 5.94934 |
| 1996 | 5.94081 |
| 1995 | 5.99722 |
| 1994 | 6.07886 |
| 1993 | 6.17764 |
| 1992 | 6.36886 |
| 1991 | 6.65435 |
| 1990 | 6.99361 |
| 1989 | 7.49999 |
| 1988 | 8.13652 |
| 1987 | 8.69434 |
| 1986 | 8.87809 |
| 1985 | 8.64419 |
| 1984 | 8.27412 |
| 1983 | 7.89322 |
| 1982 | 7.56608 |
| 1981 | 7.54644 |
| 1980 | 7.7822 |
| 1979 | 7.81138 |
| 1978 | 7.63392 |
| 1977 | 7.48564 |
| 1976 | 7.38694 |
| 1975 | 7.35962 |
| 1974 | 7.4572 |
| 1973 | 7.61218 |
| 1972 | 7.7102 |
| 1971 | 7.73823 |
| 1970 | 7.72536 |
| 1969 | 7.70371 |
| 1968 | 7.67005 |
| 1967 | 7.61538 |
| 1966 | 7.54689 |
| 1965 | 7.49119 |
| 1964 | 7.4365 |
| 1963 | 7.35208 |
| 1962 | 7.24364 |
| 1961 | 7.09032 |
| 1960 | 6.93526 |