| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 7.80795 |
| 2021 | 7.89684 |
| 2020 | 7.59704 |
| 2019 | 7.16176 |
| 2018 | 6.72151 |
| 2017 | 6.34295 |
| 2016 | 6.25734 |
| 2015 | 6.43054 |
| 2014 | 6.44263 |
| 2013 | 6.2503 |
| 2012 | 6.04774 |
| 2011 | 5.87047 |
| 2010 | 5.74934 |
| 2009 | 5.73618 |
| 2008 | 5.77342 |
| 2007 | 5.76411 |
| 2006 | 5.69228 |
| 2005 | 5.58459 |
| 2004 | 5.47612 |
| 2003 | 5.37324 |
| 2002 | 5.2656 |
| 2001 | 5.16444 |
| 2000 | 5.07426 |
| 1999 | 4.97451 |
| 1998 | 4.85377 |
| 1997 | 4.71788 |
| 1996 | 4.55881 |
| 1995 | 4.40423 |
| 1994 | 4.24182 |
| 1993 | 4.05502 |
| 1992 | 3.88741 |
| 1991 | 3.75683 |
| 1990 | 3.63364 |
| 1989 | 3.55125 |
| 1988 | 3.52947 |
| 1987 | 3.50963 |
| 1986 | 3.47199 |
| 1985 | 3.41611 |
| 1984 | 3.35126 |
| 1983 | 3.27625 |
| 1982 | 3.1847 |
| 1981 | 3.06178 |
| 1980 | 2.93225 |
| 1979 | 2.80975 |
| 1978 | 2.70006 |
| 1977 | 2.61801 |
| 1976 | 2.57712 |
| 1975 | 2.55874 |
| 1974 | 2.52313 |
| 1973 | 2.47365 |
| 1972 | 2.40584 |
| 1971 | 2.32759 |
| 1970 | 2.25685 |
| 1969 | 2.20178 |
| 1968 | 2.14262 |
| 1967 | 2.08065 |
| 1966 | 2.01891 |
| 1965 | 1.96286 |
| 1964 | 1.93515 |
| 1963 | 1.92612 |
| 1962 | 1.91592 |
| 1961 | 1.89546 |
| 1960 | 1.86649 |