| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | 1.21615 |
| 2019 | 1.19989 |
| 2018 | 1.19291 |
| 2017 | 1.18381 |
| 2016 | 1.17322 |
| 2015 | 1.17049 |
| 2014 | 1.16839 |
| 2013 | 1.1583 |
| 2012 | 1.143 |
| 2011 | 1.12649 |
| 2010 | 1.10323 |
| 2009 | 1.07669 |
| 2008 | 1.04555 |
| 2007 | 1.01396 |
| 2006 | 0.98319 |
| 2005 | 0.95985 |
| 2004 | 0.93962 |
| 2003 | 0.92856 |
| 2002 | 0.9192 |
| 2001 | 0.9148 |
| 2000 | 0.90368 |
| 1999 | 0.88649 |
| 1998 | 0.86637 |
| 1997 | 0.84338 |
| 1996 | 0.81464 |
| 1995 | 0.78708 |
| 1994 | 0.76125 |
| 1993 | 0.73706 |
| 1992 | 0.71025 |
| 1991 | 0.68055 |
| 1990 | 0.6524 |
| 1989 | 0.62239 |
| 1988 | 0.59213 |
| 1987 | 0.5639 |
| 1986 | 0.53958 |
| 1985 | 0.52212 |
| 1984 | 0.50944 |
| 1983 | 0.50041 |
| 1982 | 0.49726 |
| 1981 | 0.50509 |
| 1980 | 0.51603 |
| 1979 | 0.53225 |
| 1978 | 0.54292 |
| 1977 | 0.55274 |
| 1976 | 0.56084 |
| 1975 | 0.56872 |
| 1974 | 0.5753 |
| 1973 | 0.57071 |
| 1972 | 0.57305 |
| 1971 | 0.57199 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |