| 年份 | 尼日尔  | 
                                                            
|---|---|
| 2023 | - | 
| 2022 | 19.596 | 
| 2021 | 19.6547 | 
| 2020 | 19.692 | 
| 2019 | 19.7107 | 
| 2018 | 19.7306 | 
| 2017 | 19.7523 | 
| 2016 | 19.7908 | 
| 2015 | 19.8657 | 
| 2014 | 19.9553 | 
| 2013 | 20.0372 | 
| 2012 | 20.1236 | 
| 2011 | 20.1988 | 
| 2010 | 20.2459 | 
| 2009 | 20.2832 | 
| 2008 | 20.3079 | 
| 2007 | 20.3187 | 
| 2006 | 20.3192 | 
| 2005 | 20.3088 | 
| 2004 | 20.2859 | 
| 2003 | 20.2557 | 
| 2002 | 20.222 | 
| 2001 | 20.1823 | 
| 2000 | 20.1242 | 
| 1999 | 20.029 | 
| 1998 | 19.9015 | 
| 1997 | 19.7527 | 
| 1996 | 19.5964 | 
| 1995 | 19.4657 | 
| 1994 | 19.3716 | 
| 1993 | 19.3066 | 
| 1992 | 19.2797 | 
| 1991 | 19.2894 | 
| 1990 | 19.3338 | 
| 1989 | 19.4271 | 
| 1988 | 19.5419 | 
| 1987 | 19.6457 | 
| 1986 | 19.7487 | 
| 1985 | 19.829 | 
| 1984 | 19.8495 | 
| 1983 | 19.8236 | 
| 1982 | 19.748 | 
| 1981 | 19.6176 | 
| 1980 | 19.466 | 
| 1979 | 19.3224 | 
| 1978 | 19.2065 | 
| 1977 | 19.1389 | 
| 1976 | 19.1192 | 
| 1975 | 19.1312 | 
| 1974 | 19.1634 | 
| 1973 | 19.2098 | 
| 1972 | 19.2743 | 
| 1971 | 19.3581 | 
| 1970 | 19.4464 | 
| 1969 | 19.5303 | 
| 1968 | 19.6083 | 
| 1967 | 19.6662 | 
| 1966 | 19.7078 | 
| 1965 | 19.7481 | 
| 1964 | 19.7797 | 
| 1963 | 19.7952 | 
| 1962 | 19.7997 | 
| 1961 | 19.7941 | 
| 1960 | 19.7795 |