| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 8.00432 |
| 2021 | 7.7044 |
| 2020 | 7.40816 |
| 2019 | 7.15029 |
| 2018 | 6.91683 |
| 2017 | 6.65655 |
| 2016 | 6.35667 |
| 2015 | 6.04908 |
| 2014 | 5.76316 |
| 2013 | 5.49522 |
| 2012 | 5.23889 |
| 2011 | 4.98798 |
| 2010 | 4.73919 |
| 2009 | 4.48647 |
| 2008 | 4.23277 |
| 2007 | 3.97669 |
| 2006 | 3.709 |
| 2005 | 3.4551 |
| 2004 | 3.23151 |
| 2003 | 3.04592 |
| 2002 | 2.8995 |
| 2001 | 2.7792 |
| 2000 | 2.6695 |
| 1999 | 2.58405 |
| 1998 | 2.51976 |
| 1997 | 2.44603 |
| 1996 | 2.3604 |
| 1995 | 2.27601 |
| 1994 | 2.19028 |
| 1993 | 2.09723 |
| 1992 | 2.00552 |
| 1991 | 1.9132 |
| 1990 | 1.82459 |
| 1989 | 1.73486 |
| 1988 | 1.64827 |
| 1987 | 1.56182 |
| 1986 | 1.48186 |
| 1985 | 1.41791 |
| 1984 | 1.35732 |
| 1983 | 1.29349 |
| 1982 | 1.22043 |
| 1981 | 1.14428 |
| 1980 | 1.07507 |
| 1979 | 1.01086 |
| 1978 | 0.949951 |
| 1977 | 0.894461 |
| 1976 | 0.847911 |
| 1975 | 0.8093 |
| 1974 | 0.775726 |
| 1973 | 0.749166 |
| 1972 | 0.721625 |
| 1971 | 0.693344 |
| 1970 | 0.668868 |
| 1969 | 0.641325 |
| 1968 | 0.610997 |
| 1967 | 0.582446 |
| 1966 | 0.560461 |
| 1965 | 0.548733 |
| 1964 | 0.5374 |
| 1963 | 0.520222 |
| 1962 | 0.507313 |
| 1961 | 0.498162 |
| 1960 | 0.488248 |