| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 5.85258 |
| 2021 | 5.90875 |
| 2020 | 5.98477 |
| 2019 | 6.08856 |
| 2018 | 6.23093 |
| 2017 | 6.41446 |
| 2016 | 6.64159 |
| 2015 | 6.89754 |
| 2014 | 7.18252 |
| 2013 | 7.48975 |
| 2012 | 7.74854 |
| 2011 | 7.90551 |
| 2010 | 7.95016 |
| 2009 | 7.87518 |
| 2008 | 7.71266 |
| 2007 | 7.56907 |
| 2006 | 7.30176 |
| 2005 | 7.02907 |
| 2004 | 6.92744 |
| 2003 | 6.81061 |
| 2002 | 6.63299 |
| 2001 | 6.60051 |
| 2000 | 6.60816 |
| 1999 | 6.48792 |
| 1998 | 6.41681 |
| 1997 | 6.36783 |
| 1996 | 6.35062 |
| 1995 | 6.40267 |
| 1994 | 6.48071 |
| 1993 | 6.57616 |
| 1992 | 6.76529 |
| 1991 | 7.0469 |
| 1990 | 7.3894 |
| 1989 | 7.9167 |
| 1988 | 8.58304 |
| 1987 | 9.17517 |
| 1986 | 9.38378 |
| 1985 | 9.13659 |
| 1984 | 8.72111 |
| 1983 | 8.28823 |
| 1982 | 7.90333 |
| 1981 | 7.83955 |
| 1980 | 8.06556 |
| 1979 | 8.09447 |
| 1978 | 7.91356 |
| 1977 | 7.77043 |
| 1976 | 7.68728 |
| 1975 | 7.673 |
| 1974 | 7.78047 |
| 1973 | 7.94751 |
| 1972 | 8.05313 |
| 1971 | 8.08308 |
| 1970 | 8.07974 |
| 1969 | 8.07609 |
| 1968 | 8.05756 |
| 1967 | 8.01297 |
| 1966 | 7.93632 |
| 1965 | 7.82733 |
| 1964 | 7.65978 |
| 1963 | 7.38248 |
| 1962 | 6.99848 |
| 1961 | 6.54259 |
| 1960 | 6.11692 |