| 年份 | 乍得  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 0.168469 | 
| 2021 | 0.176627 | 
| 2020 | 0.184733 | 
| 2019 | 0.190437 | 
| 2018 | 0.192399 | 
| 2017 | 0.193363 | 
| 2016 | 0.194916 | 
| 2015 | 0.199101 | 
| 2014 | 0.204707 | 
| 2013 | 0.207949 | 
| 2012 | 0.211599 | 
| 2011 | 0.216186 | 
| 2010 | 0.221285 | 
| 2009 | 0.227671 | 
| 2008 | 0.233613 | 
| 2007 | 0.240632 | 
| 2006 | 0.248838 | 
| 2005 | 0.256759 | 
| 2004 | 0.261173 | 
| 2003 | 0.259933 | 
| 2002 | 0.259917 | 
| 2001 | 0.263285 | 
| 2000 | 0.267707 | 
| 1999 | 0.271486 | 
| 1998 | 0.274696 | 
| 1997 | 0.278323 | 
| 1996 | 0.282638 | 
| 1995 | 0.278161 | 
| 1994 | 0.270188 | 
| 1993 | 0.27812 | 
| 1992 | 0.288911 | 
| 1991 | 0.285487 | 
| 1990 | 0.283414 | 
| 1989 | 0.288522 | 
| 1988 | 0.289617 | 
| 1987 | 0.289193 | 
| 1986 | 0.284437 | 
| 1985 | 0.279582 | 
| 1984 | 0.290051 | 
| 1983 | 0.304188 | 
| 1982 | 0.288955 | 
| 1981 | 0.265443 | 
| 1980 | 0.268899 | 
| 1979 | 0.273785 | 
| 1978 | 0.27079 | 
| 1977 | 0.269553 | 
| 1976 | 0.26942 | 
| 1975 | 0.270694 | 
| 1974 | 0.273086 | 
| 1973 | 0.27666 | 
| 1972 | 0.281782 | 
| 1971 | 0.287592 | 
| 1970 | 0.293035 | 
| 1969 | 0.298204 | 
| 1968 | 0.303139 | 
| 1967 | 0.307873 | 
| 1966 | 0.312572 | 
| 1965 | 0.316715 | 
| 1964 | 0.319656 | 
| 1963 | 0.320811 | 
| 1962 | 0.320113 | 
| 1961 | 0.318604 | 
| 1960 | 0.31761 |