| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 8.141 |
| 2020 | 8.281 |
| 2019 | 7.824 |
| 2018 | 8.061 |
| 2017 | 8.239 |
| 2016 | 8.512 |
| 2015 | 8.799 |
| 2014 | 9.016 |
| 2013 | 9.346 |
| 2012 | 9.718 |
| 2011 | 10.145 |
| 2010 | 10.589 |
| 2009 | 11.206 |
| 2008 | 11.812 |
| 2007 | 12.477 |
| 2006 | 13.174 |
| 2005 | 13.922 |
| 2004 | 14.683 |
| 2003 | 15.543 |
| 2002 | 16.272 |
| 2001 | 16.912 |
| 2000 | 17.431 |
| 1999 | 17.968 |
| 1998 | 18.489 |
| 1997 | 19.074 |
| 1996 | 19.762 |
| 1995 | 20.523 |
| 1994 | 21.405 |
| 1993 | 22.213 |
| 1992 | 22.985 |
| 1991 | 23.667 |
| 1990 | 24.067 |
| 1989 | 24.665 |
| 1988 | 25.124 |
| 1987 | 25.49 |
| 1986 | 25.756 |
| 1985 | 25.813 |
| 1984 | 25.7 |
| 1983 | 25.366 |
| 1982 | 25.281 |
| 1981 | 25.241 |
| 1980 | 25.448 |
| 1979 | 25.671 |
| 1978 | 26.168 |
| 1977 | 26.782 |
| 1976 | 27.34 |
| 1975 | 27.678 |
| 1974 | 28.157 |
| 1973 | 28.376 |
| 1972 | 28.393 |
| 1971 | 28.694 |
| 1970 | 27.929 |
| 1969 | 27.624 |
| 1968 | 27.37 |
| 1967 | 27.134 |
| 1966 | 27.173 |
| 1965 | 27.244 |
| 1964 | 27.275 |
| 1963 | 27.282 |
| 1962 | 27.371 |
| 1961 | 27.444 |
| 1960 | 27.566 |