| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 6.255 |
| 2020 | 6.346 |
| 2019 | 6.412 |
| 2018 | 6.464 |
| 2017 | 6.537 |
| 2016 | 6.623 |
| 2015 | 6.706 |
| 2014 | 6.781 |
| 2013 | 6.839 |
| 2012 | 6.905 |
| 2011 | 6.948 |
| 2010 | 6.99 |
| 2009 | 7.021 |
| 2008 | 7.063 |
| 2007 | 7.092 |
| 2006 | 7.118 |
| 2005 | 7.134 |
| 2004 | 7.16 |
| 2003 | 7.179 |
| 2002 | 7.201 |
| 2001 | 7.231 |
| 2000 | 7.249 |
| 1999 | 7.262 |
| 1998 | 7.266 |
| 1997 | 7.274 |
| 1996 | 7.292 |
| 1995 | 7.29 |
| 1994 | 7.31 |
| 1993 | 7.337 |
| 1992 | 7.296 |
| 1991 | 7.261 |
| 1990 | 7.219 |
| 1989 | 7.186 |
| 1988 | 7.154 |
| 1987 | 7.105 |
| 1986 | 7.067 |
| 1985 | 7.037 |
| 1984 | 7.015 |
| 1983 | 6.979 |
| 1982 | 6.961 |
| 1981 | 6.942 |
| 1980 | 6.908 |
| 1979 | 6.905 |
| 1978 | 6.891 |
| 1977 | 6.896 |
| 1976 | 6.893 |
| 1975 | 6.876 |
| 1974 | 6.864 |
| 1973 | 6.869 |
| 1972 | 6.85 |
| 1971 | 6.582 |
| 1970 | 6.528 |
| 1969 | 6.477 |
| 1968 | 6.432 |
| 1967 | 6.393 |
| 1966 | 6.362 |
| 1965 | 6.337 |
| 1964 | 6.318 |
| 1963 | 6.301 |
| 1962 | 6.285 |
| 1961 | 6.268 |
| 1960 | 6.25 |