| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 8.87283 |
| 2021 | 8.88005 |
| 2020 | 8.8568 |
| 2019 | 8.81302 |
| 2018 | 8.78099 |
| 2017 | 8.76105 |
| 2016 | 8.7106 |
| 2015 | 8.6934 |
| 2014 | 8.72564 |
| 2013 | 8.6772 |
| 2012 | 8.57996 |
| 2011 | 8.50064 |
| 2010 | 8.42976 |
| 2009 | 8.39914 |
| 2008 | 8.40085 |
| 2007 | 8.37747 |
| 2006 | 8.34097 |
| 2005 | 8.35662 |
| 2004 | 8.32974 |
| 2003 | 8.21426 |
| 2002 | 8.24308 |
| 2001 | 8.4453 |
| 2000 | 8.63348 |
| 1999 | 8.76613 |
| 1998 | 8.89932 |
| 1997 | 9.02999 |
| 1996 | 9.11264 |
| 1995 | 9.02076 |
| 1994 | 8.87065 |
| 1993 | 8.92509 |
| 1992 | 8.97008 |
| 1991 | 8.81198 |
| 1990 | 8.73561 |
| 1989 | 8.76537 |
| 1988 | 8.71703 |
| 1987 | 8.66405 |
| 1986 | 8.56812 |
| 1985 | 8.48211 |
| 1984 | 8.62454 |
| 1983 | 8.75161 |
| 1982 | 8.42728 |
| 1981 | 8.04955 |
| 1980 | 8.21561 |
| 1979 | 8.41868 |
| 1978 | 8.42405 |
| 1977 | 8.47077 |
| 1976 | 8.52209 |
| 1975 | 8.56547 |
| 1974 | 8.47578 |
| 1973 | 8.30845 |
| 1972 | 8.20059 |
| 1971 | 8.1025 |
| 1970 | 8.00858 |
| 1969 | 8.05644 |
| 1968 | 8.18074 |
| 1967 | 8.23249 |
| 1966 | 8.26746 |
| 1965 | 8.28274 |
| 1964 | 8.2924 |
| 1963 | 8.31107 |
| 1962 | 8.33999 |
| 1961 | 8.36889 |
| 1960 | 8.38761 |