| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 4.57787 |
| 2020 | 4.70124 |
| 2019 | 4.0792 |
| 2018 | 4.32777 |
| 2017 | 6.6096 |
| 2016 | 6.51176 |
| 2015 | 5.67319 |
| 2014 | 4.31922 |
| 2013 | 4.26303 |
| 2012 | 4.26216 |
| 2011 | 3.75353 |
| 2010 | 3.73803 |
| 2009 | 4.71043 |
| 2008 | 4.24745 |
| 2007 | 4.09232 |
| 2006 | 3.39766 |
| 2005 | 3.64957 |
| 2004 | 5.06646 |
| 2003 | 9.5955 |
| 2002 | 8.65186 |
| 2001 | 8.36505 |
| 2000 | 10.5735 |
| 1999 | 9.50402 |
| 1998 | 11.6317 |
| 1997 | 12.4552 |
| 1996 | 12.7277 |
| 1995 | 14.2163 |
| 1994 | 12.1988 |
| 1993 | 8.50697 |
| 1992 | 7.23066 |
| 1991 | 6.91105 |
| 1990 | 7.51735 |
| 1989 | 7.07578 |
| 1988 | 6.58618 |
| 1987 | 7.90417 |
| 1986 | 8.60107 |
| 1985 | 5.73037 |
| 1984 | 8.31292 |
| 1983 | 10.0342 |
| 1982 | 14.6271 |
| 1981 | 10.3707 |
| 1980 | 10.0784 |
| 1979 | 8.47666 |
| 1978 | 7.21981 |
| 1977 | 8.09745 |
| 1976 | 5.35463 |
| 1975 | 5.68187 |
| 1974 | 5.81664 |
| 1973 | 5.08371 |
| 1972 | 3.47021 |
| 1971 | 3.41328 |
| 1970 | 3.97796 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |