| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 3.55283 |
| 2021 | 3.6187 |
| 2020 | 3.72278 |
| 2019 | 3.84952 |
| 2018 | 3.9804 |
| 2017 | 4.09417 |
| 2016 | 4.17453 |
| 2015 | 4.22787 |
| 2014 | 4.2798 |
| 2013 | 4.33033 |
| 2012 | 4.3759 |
| 2011 | 4.41419 |
| 2010 | 4.43158 |
| 2009 | 4.44138 |
| 2008 | 4.45763 |
| 2007 | 4.48409 |
| 2006 | 4.52978 |
| 2005 | 4.60315 |
| 2004 | 4.6783 |
| 2003 | 4.73581 |
| 2002 | 4.78253 |
| 2001 | 4.81815 |
| 2000 | 4.83503 |
| 1999 | 4.85932 |
| 1998 | 4.88877 |
| 1997 | 4.90292 |
| 1996 | 4.92396 |
| 1995 | 4.94757 |
| 1994 | 4.97205 |
| 1993 | 5.0367 |
| 1992 | 5.14995 |
| 1991 | 5.26835 |
| 1990 | 5.41646 |
| 1989 | 5.59731 |
| 1988 | 5.76168 |
| 1987 | 5.90063 |
| 1986 | 6.04084 |
| 1985 | 6.20104 |
| 1984 | 6.38478 |
| 1983 | 6.6049 |
| 1982 | 6.87207 |
| 1981 | 7.18779 |
| 1980 | 7.53789 |
| 1979 | 7.92845 |
| 1978 | 8.35277 |
| 1977 | 8.73494 |
| 1976 | 9.01802 |
| 1975 | 9.18445 |
| 1974 | 9.21695 |
| 1973 | 9.14669 |
| 1972 | 9.0884 |
| 1971 | 8.86813 |
| 1970 | 8.65356 |
| 1969 | 8.64132 |
| 1968 | 8.58647 |
| 1967 | 8.46124 |
| 1966 | 8.50331 |
| 1965 | 8.5653 |
| 1964 | 8.47376 |
| 1963 | 8.46037 |
| 1962 | 8.46142 |
| 1961 | 8.49983 |
| 1960 | 8.63678 |