| 年份 | 乍得  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 1.301 | 
| 2021 | 1.29105 | 
| 2020 | 1.28205 | 
| 2019 | 1.27083 | 
| 2018 | 1.25823 | 
| 2017 | 1.24784 | 
| 2016 | 1.23971 | 
| 2015 | 1.23461 | 
| 2014 | 1.21521 | 
| 2013 | 1.18757 | 
| 2012 | 1.17004 | 
| 2011 | 1.1559 | 
| 2010 | 1.14488 | 
| 2009 | 1.16033 | 
| 2008 | 1.1919 | 
| 2007 | 1.21321 | 
| 2006 | 1.23385 | 
| 2005 | 1.254 | 
| 2004 | 1.27644 | 
| 2003 | 1.30273 | 
| 2002 | 1.33204 | 
| 2001 | 1.36244 | 
| 2000 | 1.3922 | 
| 1999 | 1.42052 | 
| 1998 | 1.44671 | 
| 1997 | 1.47104 | 
| 1996 | 1.49684 | 
| 1995 | 1.52885 | 
| 1994 | 1.5634 | 
| 1993 | 1.59284 | 
| 1992 | 1.62466 | 
| 1991 | 1.66551 | 
| 1990 | 1.70527 | 
| 1989 | 1.74108 | 
| 1988 | 1.77958 | 
| 1987 | 1.81952 | 
| 1986 | 1.85962 | 
| 1985 | 1.89428 | 
| 1984 | 1.91525 | 
| 1983 | 1.93864 | 
| 1982 | 1.98867 | 
| 1981 | 2.03464 | 
| 1980 | 2.03833 | 
| 1979 | 2.039 | 
| 1978 | 2.05154 | 
| 1977 | 2.05849 | 
| 1976 | 2.06535 | 
| 1975 | 2.07449 | 
| 1974 | 2.08592 | 
| 1973 | 2.09917 | 
| 1972 | 2.11493 | 
| 1971 | 2.13212 | 
| 1970 | 2.14961 | 
| 1969 | 2.16806 | 
| 1968 | 2.18848 | 
| 1967 | 2.21063 | 
| 1966 | 2.2322 | 
| 1965 | 2.25153 | 
| 1964 | 2.26913 | 
| 1963 | 2.28592 | 
| 1962 | 2.29997 | 
| 1961 | 2.30803 | 
| 1960 | 2.30821 |