| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 24.063 |
| 2021 | 23.781 |
| 2020 | 23.52 |
| 2019 | 23.279 |
| 2018 | 23.059 |
| 2017 | 22.858 |
| 2016 | 22.677 |
| 2015 | 22.515 |
| 2014 | 22.372 |
| 2013 | 22.248 |
| 2012 | 22.142 |
| 2011 | 22.054 |
| 2010 | 21.985 |
| 2009 | 21.934 |
| 2008 | 21.901 |
| 2007 | 21.868 |
| 2006 | 21.834 |
| 2005 | 21.801 |
| 2004 | 21.768 |
| 2003 | 21.735 |
| 2002 | 21.702 |
| 2001 | 21.67 |
| 2000 | 21.637 |
| 1999 | 21.604 |
| 1998 | 21.571 |
| 1997 | 21.538 |
| 1996 | 21.506 |
| 1995 | 21.473 |
| 1994 | 21.44 |
| 1993 | 21.408 |
| 1992 | 21.235 |
| 1991 | 21.023 |
| 1990 | 20.811 |
| 1989 | 20.602 |
| 1988 | 20.394 |
| 1987 | 20.187 |
| 1986 | 19.983 |
| 1985 | 19.779 |
| 1984 | 19.578 |
| 1983 | 19.377 |
| 1982 | 19.179 |
| 1981 | 18.982 |
| 1980 | 18.787 |
| 1979 | 18.592 |
| 1978 | 18.4 |
| 1977 | 17.413 |
| 1976 | 16.47 |
| 1975 | 15.566 |
| 1974 | 14.704 |
| 1973 | 13.882 |
| 1972 | 13.1 |
| 1971 | 12.313 |
| 1970 | 11.568 |
| 1969 | 10.862 |
| 1968 | 10.196 |
| 1967 | 9.564 |
| 1966 | 8.968 |
| 1965 | 8.406 |
| 1964 | 7.877 |
| 1963 | 7.527 |
| 1962 | 7.239 |
| 1961 | 6.962 |
| 1960 | 6.695 |