| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 4.63889 |
| 2021 | 4.60444 |
| 2020 | 4.60493 |
| 2019 | 4.61493 |
| 2018 | 4.60749 |
| 2017 | 4.64983 |
| 2016 | 4.75239 |
| 2015 | 4.84735 |
| 2014 | 4.91671 |
| 2013 | 4.97116 |
| 2012 | 5.02083 |
| 2011 | 5.04809 |
| 2010 | 5.04472 |
| 2009 | 5.02636 |
| 2008 | 4.98386 |
| 2007 | 4.92955 |
| 2006 | 4.88615 |
| 2005 | 4.85203 |
| 2004 | 4.80142 |
| 2003 | 4.7326 |
| 2002 | 4.68545 |
| 2001 | 4.66324 |
| 2000 | 4.64392 |
| 1999 | 4.61576 |
| 1998 | 4.58209 |
| 1997 | 4.54969 |
| 1996 | 4.51773 |
| 1995 | 4.43844 |
| 1994 | 4.36046 |
| 1993 | 4.39954 |
| 1992 | 4.44291 |
| 1991 | 4.38929 |
| 1990 | 4.37145 |
| 1989 | 4.33525 |
| 1988 | 4.22551 |
| 1987 | 4.15189 |
| 1986 | 4.07504 |
| 1985 | 4.0265 |
| 1984 | 4.17805 |
| 1983 | 4.36064 |
| 1982 | 4.30246 |
| 1981 | 4.24204 |
| 1980 | 4.4175 |
| 1979 | 4.5858 |
| 1978 | 4.66378 |
| 1977 | 4.76288 |
| 1976 | 4.85894 |
| 1975 | 4.94075 |
| 1974 | 5.00588 |
| 1973 | 5.05637 |
| 1972 | 5.1 |
| 1971 | 5.14323 |
| 1970 | 5.18818 |
| 1969 | 5.23586 |
| 1968 | 5.28445 |
| 1967 | 5.33513 |
| 1966 | 5.38607 |
| 1965 | 5.4343 |
| 1964 | 5.47997 |
| 1963 | 5.5244 |
| 1962 | 5.56813 |
| 1961 | 5.61267 |
| 1960 | 5.65837 |