| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 5.09613 |
| 2021 | 5.09449 |
| 2020 | 5.06815 |
| 2019 | 5.05757 |
| 2018 | 5.05984 |
| 2017 | 5.04433 |
| 2016 | 5.03629 |
| 2015 | 5.03253 |
| 2014 | 5.02749 |
| 2013 | 5.06006 |
| 2012 | 5.14142 |
| 2011 | 5.22786 |
| 2010 | 5.34492 |
| 2009 | 5.49659 |
| 2008 | 5.63279 |
| 2007 | 5.74249 |
| 2006 | 5.85004 |
| 2005 | 5.97058 |
| 2004 | 6.1095 |
| 2003 | 6.2834 |
| 2002 | 6.50113 |
| 2001 | 6.76387 |
| 2000 | 7.05588 |
| 1999 | 7.37544 |
| 1998 | 7.71602 |
| 1997 | 8.0112 |
| 1996 | 8.20608 |
| 1995 | 8.28197 |
| 1994 | 8.23017 |
| 1993 | 8.08388 |
| 1992 | 7.95193 |
| 1991 | 7.68839 |
| 1990 | 7.42227 |
| 1989 | 7.33324 |
| 1988 | 7.2252 |
| 1987 | 7.06024 |
| 1986 | 7.05058 |
| 1985 | 7.07307 |
| 1984 | 6.96049 |
| 1983 | 6.90727 |
| 1982 | 6.87409 |
| 1981 | 6.87379 |
| 1980 | 6.95005 |
| 1979 | 7.06223 |
| 1978 | 7.20731 |
| 1977 | 7.46535 |
| 1976 | 7.82395 |
| 1975 | 8.25012 |
| 1974 | 8.88585 |
| 1973 | 9.67892 |
| 1972 | 10.4006 |
| 1971 | 10.712 |
| 1970 | 10.5237 |
| 1969 | 10.1332 |
| 1968 | 9.69568 |
| 1967 | 9.30317 |
| 1966 | 9.26381 |
| 1965 | 9.56366 |
| 1964 | 9.65821 |
| 1963 | 9.49489 |
| 1962 | 9.34216 |
| 1961 | 9.23075 |
| 1960 | 9.18885 |