| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 4.20902 |
| 2020 | 4.20902 |
| 2019 | 4.20902 |
| 2018 | 4.20902 |
| 2017 | 4.20902 |
| 2016 | 4.20902 |
| 2015 | 4.12961 |
| 2014 | 4.12961 |
| 2013 | 3.97078 |
| 2012 | 3.69282 |
| 2011 | 3.41487 |
| 2010 | 3.33545 |
| 2009 | 3.17662 |
| 2008 | 3.0972 |
| 2007 | 3.0972 |
| 2006 | 3.0972 |
| 2005 | 3.0972 |
| 2004 | 3.01779 |
| 2003 | 3.01779 |
| 2002 | 2.93837 |
| 2001 | 2.93837 |
| 2000 | 2.85896 |
| 1999 | 2.85896 |
| 1998 | 2.85896 |
| 1997 | 2.85896 |
| 1996 | 2.70013 |
| 1995 | 2.71601 |
| 1994 | 2.69219 |
| 1993 | 2.6763 |
| 1992 | 2.65407 |
| 1991 | 2.63818 |
| 1990 | 2.59927 |
| 1989 | 2.55956 |
| 1988 | 2.54368 |
| 1987 | 2.52541 |
| 1986 | 2.52541 |
| 1985 | 2.48571 |
| 1984 | 2.48332 |
| 1983 | 2.48571 |
| 1982 | 2.48729 |
| 1981 | 2.48968 |
| 1980 | 2.49126 |
| 1979 | 2.49365 |
| 1978 | 2.49603 |
| 1977 | 2.45791 |
| 1976 | 2.45791 |
| 1975 | 2.38008 |
| 1974 | 2.31581 |
| 1973 | 2.30714 |
| 1972 | 2.29921 |
| 1971 | 2.29921 |
| 1970 | 2.29921 |
| 1969 | 2.29921 |
| 1968 | 2.29921 |
| 1967 | 2.29921 |
| 1966 | 2.29921 |
| 1965 | 2.29921 |
| 1964 | 2.29921 |
| 1963 | 2.29921 |
| 1962 | 2.29921 |
| 1961 | 2.29921 |
| 1960 | - |