| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 3.33651 |
| 2020 | 3.42519 |
| 2019 | 3.51175 |
| 2018 | 3.60149 |
| 2017 | 3.69361 |
| 2016 | 3.78733 |
| 2015 | 3.88342 |
| 2014 | 3.98507 |
| 2013 | 4.08672 |
| 2012 | 4.18837 |
| 2011 | 4.29003 |
| 2010 | 4.39168 |
| 2009 | 4.45704 |
| 2008 | 4.5224 |
| 2007 | 4.58775 |
| 2006 | 4.65311 |
| 2005 | 4.71847 |
| 2004 | 4.78383 |
| 2003 | 4.84919 |
| 2002 | 4.91455 |
| 2001 | 4.97991 |
| 2000 | 5.04527 |
| 1999 | 5.07521 |
| 1998 | 5.10515 |
| 1997 | 5.13509 |
| 1996 | 5.16503 |
| 1995 | 5.19496 |
| 1994 | 5.2249 |
| 1993 | 5.25484 |
| 1992 | 5.28478 |
| 1991 | 5.31472 |
| 1990 | 5.34466 |
| 1989 | - |
| 1988 | - |
| 1987 | - |
| 1986 | - |
| 1985 | - |
| 1984 | - |
| 1983 | - |
| 1982 | - |
| 1981 | - |
| 1980 | - |
| 1979 | - |
| 1978 | - |
| 1977 | - |
| 1976 | - |
| 1975 | - |
| 1974 | - |
| 1973 | - |
| 1972 | - |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |