| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | - |
| 2019 | - |
| 2018 | - |
| 2017 | - |
| 2016 | 31.1831 |
| 2015 | 30.7251 |
| 2014 | 30.7398 |
| 2013 | 31.1392 |
| 2012 | 31.0079 |
| 2011 | 30.0966 |
| 2010 | 29.3801 |
| 2009 | 28.8807 |
| 2008 | 28.7438 |
| 2007 | 30.5823 |
| 2006 | 26.0767 |
| 2005 | 25.3572 |
| 2004 | 24.5276 |
| 2003 | 24.0443 |
| 2002 | 24.6945 |
| 2001 | 23.1001 |
| 2000 | 21.8657 |
| 1999 | 20.4509 |
| 1998 | 20.322 |
| 1997 | 19.9864 |
| 1996 | 19.374 |
| 1995 | 18.7309 |
| 1994 | 17.4639 |
| 1993 | - |
| 1992 | - |
| 1991 | 15.7509 |
| 1990 | 17.8006 |
| 1989 | 15.609 |
| 1988 | 15.2825 |
| 1987 | 15.0174 |
| 1986 | - |
| 1985 | 15.165 |
| 1984 | - |
| 1983 | - |
| 1982 | - |
| 1981 | - |
| 1980 | - |
| 1979 | - |
| 1978 | - |
| 1977 | - |
| 1976 | - |
| 1975 | - |
| 1974 | 11.3768 |
| 1973 | - |
| 1972 | 9.05844 |
| 1971 | 8.10544 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |