| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 6.14526 |
| 2021 | 6.05091 |
| 2020 | 6.20769 |
| 2019 | 6.20425 |
| 2018 | 6.00002 |
| 2017 | 5.78521 |
| 2016 | 5.59466 |
| 2015 | 5.45976 |
| 2014 | 5.43036 |
| 2013 | 5.45083 |
| 2012 | 5.42776 |
| 2011 | 5.34705 |
| 2010 | 5.23352 |
| 2009 | 5.11922 |
| 2008 | 5.01104 |
| 2007 | 4.89914 |
| 2006 | 4.79398 |
| 2005 | 4.69933 |
| 2004 | 4.59428 |
| 2003 | 4.46881 |
| 2002 | 4.32914 |
| 2001 | 4.16736 |
| 2000 | 4.00844 |
| 1999 | 3.84469 |
| 1998 | 3.66093 |
| 1997 | 3.49316 |
| 1996 | 3.35943 |
| 1995 | 3.23437 |
| 1994 | 3.1474 |
| 1993 | 3.11665 |
| 1992 | 3.08845 |
| 1991 | 3.04264 |
| 1990 | 2.97877 |
| 1989 | 2.90454 |
| 1988 | 2.82085 |
| 1987 | 2.72303 |
| 1986 | 2.59873 |
| 1985 | 2.46976 |
| 1984 | 2.34659 |
| 1983 | 2.23376 |
| 1982 | 2.14214 |
| 1981 | 2.08486 |
| 1980 | 2.04978 |
| 1979 | 2.00103 |
| 1978 | 1.93938 |
| 1977 | 1.86537 |
| 1976 | 1.78734 |
| 1975 | 1.71525 |
| 1974 | 1.65808 |
| 1973 | 1.60458 |
| 1972 | 1.54853 |
| 1971 | 1.49526 |
| 1970 | 1.4494 |
| 1969 | 1.42079 |
| 1968 | 1.40636 |
| 1967 | 1.39198 |
| 1966 | 1.36643 |
| 1965 | 1.33803 |
| 1964 | 1.30415 |
| 1963 | 1.2684 |
| 1962 | 1.24657 |
| 1961 | 1.24335 |
| 1960 | 1.24559 |