| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 18.4468 |
| 2021 | 18.5296 |
| 2020 | 18.6501 |
| 2019 | 18.7906 |
| 2018 | 18.9658 |
| 2017 | 19.1683 |
| 2016 | 19.3534 |
| 2015 | 19.4706 |
| 2014 | 19.5413 |
| 2013 | 19.6374 |
| 2012 | 19.7223 |
| 2011 | 19.7892 |
| 2010 | 19.8504 |
| 2009 | 19.8807 |
| 2008 | 19.8805 |
| 2007 | 19.8271 |
| 2006 | 19.772 |
| 2005 | 19.7476 |
| 2004 | 19.8039 |
| 2003 | 20.0025 |
| 2002 | 20.185 |
| 2001 | 20.2796 |
| 2000 | 20.284 |
| 1999 | 20.2213 |
| 1998 | 20.2065 |
| 1997 | 20.2266 |
| 1996 | 20.1519 |
| 1995 | 20.2264 |
| 1994 | 20.3965 |
| 1993 | 20.1346 |
| 1992 | 19.7356 |
| 1991 | 19.6135 |
| 1990 | 19.4182 |
| 1989 | 19.1468 |
| 1988 | 19.0439 |
| 1987 | 18.8686 |
| 1986 | 18.6693 |
| 1985 | 18.5672 |
| 1984 | 18.2307 |
| 1983 | 17.8658 |
| 1982 | 18.1959 |
| 1981 | 18.7865 |
| 1980 | 18.7003 |
| 1979 | 18.4981 |
| 1978 | 18.5457 |
| 1977 | 18.5343 |
| 1976 | 18.4358 |
| 1975 | 18.2498 |
| 1974 | 18.0331 |
| 1973 | 17.7816 |
| 1972 | 17.4922 |
| 1971 | 17.2499 |
| 1970 | 17.0846 |
| 1969 | 16.9475 |
| 1968 | 16.8451 |
| 1967 | 16.7715 |
| 1966 | 16.7188 |
| 1965 | 16.6846 |
| 1964 | 16.6634 |
| 1963 | 16.6484 |
| 1962 | 16.6351 |
| 1961 | 16.6229 |
| 1960 | 16.6118 |