| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 4.50363 |
| 2021 | 4.5296 |
| 2020 | 4.53463 |
| 2019 | 4.52951 |
| 2018 | 4.53046 |
| 2017 | 4.54402 |
| 2016 | 4.57961 |
| 2015 | 4.64587 |
| 2014 | 4.71408 |
| 2013 | 4.76381 |
| 2012 | 4.80119 |
| 2011 | 4.82469 |
| 2010 | 4.82817 |
| 2009 | 4.84099 |
| 2008 | 4.85957 |
| 2007 | 4.86075 |
| 2006 | 4.86742 |
| 2005 | 4.87616 |
| 2004 | 4.88511 |
| 2003 | 4.93436 |
| 2002 | 5.03431 |
| 2001 | 5.13996 |
| 2000 | 5.27421 |
| 1999 | 5.43873 |
| 1998 | 5.58411 |
| 1997 | 5.70285 |
| 1996 | 5.82139 |
| 1995 | 5.95632 |
| 1994 | 6.11395 |
| 1993 | 6.3065 |
| 1992 | 6.53973 |
| 1991 | 6.81792 |
| 1990 | 7.12625 |
| 1989 | 7.46664 |
| 1988 | 7.833 |
| 1987 | 8.15503 |
| 1986 | 8.37527 |
| 1985 | 8.47804 |
| 1984 | 8.45417 |
| 1983 | 8.33197 |
| 1982 | 8.22187 |
| 1981 | 7.97116 |
| 1980 | 7.72929 |
| 1979 | 7.68005 |
| 1978 | 7.60871 |
| 1977 | 7.48332 |
| 1976 | 7.52533 |
| 1975 | 7.58982 |
| 1974 | 7.51042 |
| 1973 | 7.50748 |
| 1972 | 7.5239 |
| 1971 | 7.57579 |
| 1970 | 7.71047 |
| 1969 | 7.88159 |
| 1968 | 8.08752 |
| 1967 | 8.42266 |
| 1966 | 8.85559 |
| 1965 | 9.3652 |
| 1964 | 10.1345 |
| 1963 | 11.0729 |
| 1962 | 11.9031 |
| 1961 | 12.2304 |
| 1960 | 11.9685 |