| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 13.279 |
| 2021 | 13.2823 |
| 2020 | 13.2675 |
| 2019 | 13.2466 |
| 2018 | 13.2245 |
| 2017 | 13.1984 |
| 2016 | 13.17 |
| 2015 | 13.1367 |
| 2014 | 13.0898 |
| 2013 | 13.0357 |
| 2012 | 12.9864 |
| 2011 | 12.9348 |
| 2010 | 12.8694 |
| 2009 | 12.7865 |
| 2008 | 12.6859 |
| 2007 | 12.5745 |
| 2006 | 12.4606 |
| 2005 | 12.3574 |
| 2004 | 12.2769 |
| 2003 | 12.2213 |
| 2002 | 12.1957 |
| 2001 | 12.1984 |
| 2000 | 12.2307 |
| 1999 | 12.3023 |
| 1998 | 12.3982 |
| 1997 | 12.4993 |
| 1996 | 12.6131 |
| 1995 | 12.7306 |
| 1994 | 12.8151 |
| 1993 | 12.8617 |
| 1992 | 12.8669 |
| 1991 | 12.8233 |
| 1990 | 12.7526 |
| 1989 | 12.6725 |
| 1988 | 12.5939 |
| 1987 | 12.5344 |
| 1986 | 12.5005 |
| 1985 | 12.4904 |
| 1984 | 12.5101 |
| 1983 | 12.5635 |
| 1982 | 12.6536 |
| 1981 | 12.7754 |
| 1980 | 12.9146 |
| 1979 | 13.0601 |
| 1978 | 13.1982 |
| 1977 | 13.3105 |
| 1976 | 13.3956 |
| 1975 | 13.4625 |
| 1974 | 13.5099 |
| 1973 | 13.5398 |
| 1972 | 13.5604 |
| 1971 | 13.5742 |
| 1970 | 13.5869 |
| 1969 | 13.6044 |
| 1968 | 13.6278 |
| 1967 | 13.6597 |
| 1966 | 13.6939 |
| 1965 | 13.7217 |
| 1964 | 13.3825 |
| 1963 | 12.7541 |
| 1962 | 12.296 |
| 1961 | 11.9744 |
| 1960 | 11.7319 |