| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 13.0435 |
| 2021 | 13.0136 |
| 2020 | 12.9846 |
| 2019 | 12.9448 |
| 2018 | 12.8877 |
| 2017 | 12.8099 |
| 2016 | 12.7327 |
| 2015 | 12.6507 |
| 2014 | 12.5905 |
| 2013 | 12.6188 |
| 2012 | 12.675 |
| 2011 | 12.7155 |
| 2010 | 12.7109 |
| 2009 | 12.6498 |
| 2008 | 12.6286 |
| 2007 | 12.633 |
| 2006 | 12.5765 |
| 2005 | 12.5436 |
| 2004 | 12.6129 |
| 2003 | 12.6482 |
| 2002 | 12.5427 |
| 2001 | 12.3846 |
| 2000 | 12.219 |
| 1999 | 12.1023 |
| 1998 | 12.056 |
| 1997 | 11.9498 |
| 1996 | 11.8159 |
| 1995 | 11.8744 |
| 1994 | 11.9415 |
| 1993 | 11.7875 |
| 1992 | 11.8095 |
| 1991 | 12.1643 |
| 1990 | 12.4173 |
| 1989 | 12.5164 |
| 1988 | 12.6789 |
| 1987 | 12.8312 |
| 1986 | 12.9204 |
| 1985 | 12.8639 |
| 1984 | 12.5828 |
| 1983 | 12.3243 |
| 1982 | 12.3814 |
| 1981 | 12.4187 |
| 1980 | 12.074 |
| 1979 | 11.7888 |
| 1978 | 11.7107 |
| 1977 | 11.6319 |
| 1976 | 11.5768 |
| 1975 | 11.5449 |
| 1974 | 11.5337 |
| 1973 | 11.54 |
| 1972 | 11.5557 |
| 1971 | 11.5618 |
| 1970 | 11.5545 |
| 1969 | 11.5414 |
| 1968 | 11.5211 |
| 1967 | 11.4956 |
| 1966 | 11.4674 |
| 1965 | 11.4408 |
| 1964 | 11.2463 |
| 1963 | 10.9412 |
| 1962 | 10.6966 |
| 1961 | 10.4571 |
| 1960 | 10.2262 |