| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 4.60466 |
| 2021 | 4.60635 |
| 2020 | 4.58583 |
| 2019 | 4.5802 |
| 2018 | 4.58512 |
| 2017 | 4.57215 |
| 2016 | 4.56405 |
| 2015 | 4.56022 |
| 2014 | 4.5588 |
| 2013 | 4.59484 |
| 2012 | 4.67477 |
| 2011 | 4.75845 |
| 2010 | 4.86736 |
| 2009 | 5.0055 |
| 2008 | 5.12968 |
| 2007 | 5.23293 |
| 2006 | 5.33694 |
| 2005 | 5.45213 |
| 2004 | 5.58211 |
| 2003 | 5.74263 |
| 2002 | 5.943 |
| 2001 | 6.1852 |
| 2000 | 6.45826 |
| 1999 | 6.76023 |
| 1998 | 7.08362 |
| 1997 | 7.36563 |
| 1996 | 7.5548 |
| 1995 | 7.63523 |
| 1994 | 7.59855 |
| 1993 | 7.47367 |
| 1992 | 7.36584 |
| 1991 | 7.13447 |
| 1990 | 6.89707 |
| 1989 | 6.82503 |
| 1988 | 6.73363 |
| 1987 | 6.58169 |
| 1986 | 6.57479 |
| 1985 | 6.60295 |
| 1984 | 6.50567 |
| 1983 | 6.46827 |
| 1982 | 6.45107 |
| 1981 | 6.46501 |
| 1980 | 6.55093 |
| 1979 | 6.67076 |
| 1978 | 6.82366 |
| 1977 | 7.08791 |
| 1976 | 7.45132 |
| 1975 | 7.8722 |
| 1974 | 8.48525 |
| 1973 | 9.25249 |
| 1972 | 9.94997 |
| 1971 | 10.2478 |
| 1970 | 10.0816 |
| 1969 | 9.74207 |
| 1968 | 9.35658 |
| 1967 | 9.01488 |
| 1966 | 9.01601 |
| 1965 | 9.32612 |
| 1964 | 9.41665 |
| 1963 | 9.25501 |
| 1962 | 9.10616 |
| 1961 | 8.99398 |
| 1960 | 8.95066 |