| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 0.346312 |
| 2021 | 0.354187 |
| 2020 | 0.361275 |
| 2019 | 0.366582 |
| 2018 | 0.37144 |
| 2017 | 0.37779 |
| 2016 | 0.385278 |
| 2015 | 0.393194 |
| 2014 | 0.401476 |
| 2013 | 0.410363 |
| 2012 | 0.419449 |
| 2011 | 0.429053 |
| 2010 | 0.439563 |
| 2009 | 0.4506 |
| 2008 | 0.461647 |
| 2007 | 0.472416 |
| 2006 | 0.483869 |
| 2005 | 0.496707 |
| 2004 | 0.510924 |
| 2003 | 0.526512 |
| 2002 | 0.54168 |
| 2001 | 0.555327 |
| 2000 | 0.567685 |
| 1999 | 0.579432 |
| 1998 | 0.590237 |
| 1997 | 0.599505 |
| 1996 | 0.608609 |
| 1995 | 0.621538 |
| 1994 | 0.63519 |
| 1993 | 0.642699 |
| 1992 | 0.650919 |
| 1991 | 0.665058 |
| 1990 | 0.676246 |
| 1989 | 0.683953 |
| 1988 | 0.694431 |
| 1987 | 0.704676 |
| 1986 | 0.71355 |
| 1985 | 0.718188 |
| 1984 | 0.713142 |
| 1983 | 0.707181 |
| 1982 | 0.714077 |
| 1981 | 0.720755 |
| 1980 | 0.712464 |
| 1979 | 0.709096 |
| 1978 | 0.717912 |
| 1977 | 0.728492 |
| 1976 | 0.737156 |
| 1975 | 0.741375 |
| 1974 | 0.740181 |
| 1973 | 0.730788 |
| 1972 | 0.714512 |
| 1971 | 0.699086 |
| 1970 | 0.690204 |
| 1969 | 0.68849 |
| 1968 | 0.695439 |
| 1967 | 0.710423 |
| 1966 | 0.727184 |
| 1965 | 0.740921 |
| 1964 | 0.750639 |
| 1963 | 0.756224 |
| 1962 | 0.757859 |
| 1961 | 0.75835 |
| 1960 | 0.759786 |