| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | 0.505834 |
| 2021 | 0.503889 |
| 2020 | 0.501877 |
| 2019 | 0.508411 |
| 2018 | 0.519861 |
| 2017 | 0.52656 |
| 2016 | 0.533039 |
| 2015 | 0.539657 |
| 2014 | 0.54769 |
| 2013 | 0.557474 |
| 2012 | 0.568998 |
| 2011 | 0.581463 |
| 2010 | 0.59416 |
| 2009 | 0.606527 |
| 2008 | 0.618065 |
| 2007 | 0.628927 |
| 2006 | 0.640296 |
| 2005 | 0.653056 |
| 2004 | 0.667068 |
| 2003 | 0.681808 |
| 2002 | 0.696693 |
| 2001 | 0.711822 |
| 2000 | 0.727577 |
| 1999 | 0.744015 |
| 1998 | 0.760891 |
| 1997 | 0.777499 |
| 1996 | 0.794213 |
| 1995 | 0.813499 |
| 1994 | 0.83279 |
| 1993 | 0.847385 |
| 1992 | 0.862593 |
| 1991 | 0.882046 |
| 1990 | 0.898159 |
| 1989 | 0.909377 |
| 1988 | 0.919991 |
| 1987 | 0.929905 |
| 1986 | 0.938803 |
| 1985 | 0.94412 |
| 1984 | 0.942867 |
| 1983 | 0.943733 |
| 1982 | 0.95819 |
| 1981 | 0.971646 |
| 1980 | 0.968405 |
| 1979 | 0.967585 |
| 1978 | 0.976145 |
| 1977 | 0.985122 |
| 1976 | 0.994698 |
| 1975 | 1.00443 |
| 1974 | 1.01456 |
| 1973 | 1.025 |
| 1972 | 1.03469 |
| 1971 | 1.04155 |
| 1970 | 1.04365 |
| 1969 | 1.04055 |
| 1968 | 1.03154 |
| 1967 | 1.0192 |
| 1966 | 1.00905 |
| 1965 | 1.00502 |
| 1964 | 1.00783 |
| 1963 | 1.0185 |
| 1962 | 1.03676 |
| 1961 | 1.05854 |
| 1960 | 1.08047 |