| 年份 | 乍得 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.308503 |
| 2020 | 0.31842 |
| 2019 | 0.328644 |
| 2018 | 0.339652 |
| 2017 | 0.351322 |
| 2016 | 0.363198 |
| 2015 | 0.367744 |
| 2014 | 0.379642 |
| 2013 | 0.378307 |
| 2012 | 0.364566 |
| 2011 | 0.34909 |
| 2010 | 0.353098 |
| 2009 | 0.347943 |
| 2008 | 0.351394 |
| 2007 | 0.363713 |
| 2006 | 0.376244 |
| 2005 | 0.389805 |
| 2004 | 0.395277 |
| 2003 | 0.413207 |
| 2002 | 0.418629 |
| 2001 | 0.433316 |
| 2000 | 0.435881 |
| 1999 | 0.451021 |
| 1998 | 0.46698 |
| 1997 | 0.483165 |
| 1996 | 0.472203 |
| 1995 | 0.496454 |
| 1994 | 0.514182 |
| 1993 | 0.52262 |
| 1992 | 0.53023 |
| 1991 | 0.549779 |
| 1990 | 0.561689 |
| 1989 | 0.568368 |
| 1988 | 0.584165 |
| 1987 | 0.599904 |
| 1986 | 0.621317 |
| 1985 | 0.630084 |
| 1984 | 0.635497 |
| 1983 | 0.644143 |
| 1982 | 0.677507 |
| 1981 | 0.711009 |
| 1980 | 0.711623 |
| 1979 | 0.71316 |
| 1978 | 0.728646 |
| 1977 | 0.730202 |
| 1976 | 0.743445 |
| 1975 | 0.73382 |
| 1974 | 0.729148 |
| 1973 | 0.742926 |
| 1972 | 0.757505 |
| 1971 | 0.774074 |
| 1970 | 0.789934 |
| 1969 | 0.805807 |
| 1968 | 0.821432 |
| 1967 | 0.836881 |
| 1966 | 0.852394 |
| 1965 | 0.868317 |
| 1964 | 0.885007 |
| 1963 | 0.902409 |
| 1962 | 0.920196 |
| 1961 | 0.938252 |
| 1960 | - |