| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 19.884 |
| 2021 | 20.1475 |
| 2020 | 20.3683 |
| 2019 | 20.5839 |
| 2018 | 20.7969 |
| 2017 | 20.9707 |
| 2016 | 21.081 |
| 2015 | 21.1231 |
| 2014 | 21.0846 |
| 2013 | 20.9736 |
| 2012 | 20.8599 |
| 2011 | 20.8343 |
| 2010 | 20.887 |
| 2009 | 20.9301 |
| 2008 | 20.912 |
| 2007 | 20.8435 |
| 2006 | 20.7841 |
| 2005 | 20.7524 |
| 2004 | 20.7759 |
| 2003 | 20.8667 |
| 2002 | 20.9819 |
| 2001 | 21.0771 |
| 2000 | 21.1913 |
| 1999 | 21.3802 |
| 1998 | 21.6143 |
| 1997 | 21.8552 |
| 1996 | 22.1122 |
| 1995 | 22.4503 |
| 1994 | 22.8831 |
| 1993 | 23.4134 |
| 1992 | 24.0509 |
| 1991 | 24.7735 |
| 1990 | 25.6342 |
| 1989 | 26.6634 |
| 1988 | 27.8042 |
| 1987 | 28.9311 |
| 1986 | 29.983 |
| 1985 | 30.929 |
| 1984 | 31.771 |
| 1983 | 32.5741 |
| 1982 | 33.405 |
| 1981 | 33.8548 |
| 1980 | 34.1643 |
| 1979 | 34.6751 |
| 1978 | 35.0143 |
| 1977 | 35.1991 |
| 1976 | 35.2458 |
| 1975 | 35.1656 |
| 1974 | 34.9522 |
| 1973 | 34.6403 |
| 1972 | 34.2763 |
| 1971 | 34.0125 |
| 1970 | 33.9718 |
| 1969 | 34.0781 |
| 1968 | 34.303 |
| 1967 | 34.6597 |
| 1966 | 35.5512 |
| 1965 | 36.8111 |
| 1964 | 38.421 |
| 1963 | 40.6455 |
| 1962 | 43.0201 |
| 1961 | 44.7249 |
| 1960 | 45.5817 |