| 年份 | 日本 |
|---|---|
| 2023 | - |
| 2022 | 3.20673 |
| 2021 | 3.27043 |
| 2020 | 3.36735 |
| 2019 | 3.48266 |
| 2018 | 3.60137 |
| 2017 | 3.70514 |
| 2016 | 3.77802 |
| 2015 | 3.82602 |
| 2014 | 3.87431 |
| 2013 | 3.92257 |
| 2012 | 3.96499 |
| 2011 | 4.00188 |
| 2010 | 4.02297 |
| 2009 | 4.03741 |
| 2008 | 4.0565 |
| 2007 | 4.08454 |
| 2006 | 4.12998 |
| 2005 | 4.19948 |
| 2004 | 4.27002 |
| 2003 | 4.32669 |
| 2002 | 4.37645 |
| 2001 | 4.41603 |
| 2000 | 4.4394 |
| 1999 | 4.46966 |
| 1998 | 4.50177 |
| 1997 | 4.51693 |
| 1996 | 4.53664 |
| 1995 | 4.55953 |
| 1994 | 4.58427 |
| 1993 | 4.64715 |
| 1992 | 4.7552 |
| 1991 | 4.86735 |
| 1990 | 5.00511 |
| 1989 | 5.17407 |
| 1988 | 5.32871 |
| 1987 | 5.46065 |
| 1986 | 5.59538 |
| 1985 | 5.74594 |
| 1984 | 5.91543 |
| 1983 | 6.11893 |
| 1982 | 6.36594 |
| 1981 | 6.65723 |
| 1980 | 6.98151 |
| 1979 | 7.34405 |
| 1978 | 7.73761 |
| 1977 | 8.09033 |
| 1976 | 8.34867 |
| 1975 | 8.49533 |
| 1974 | 8.51409 |
| 1973 | 8.43525 |
| 1972 | 8.37716 |
| 1971 | 8.17278 |
| 1970 | 7.97763 |
| 1969 | 7.98121 |
| 1968 | 7.94632 |
| 1967 | 7.83553 |
| 1966 | 7.87988 |
| 1965 | 7.94615 |
| 1964 | 7.86416 |
| 1963 | 7.85652 |
| 1962 | 7.86369 |
| 1961 | 7.9042 |
| 1960 | 8.02994 |