| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 13.2196 |
| 2021 | 13.2256 |
| 2020 | 13.2136 |
| 2019 | 13.1946 |
| 2018 | 13.1703 |
| 2017 | 13.1377 |
| 2016 | 13.101 |
| 2015 | 13.0594 |
| 2014 | 13.0035 |
| 2013 | 12.9388 |
| 2012 | 12.877 |
| 2011 | 12.8118 |
| 2010 | 12.7334 |
| 2009 | 12.6387 |
| 2008 | 12.5282 |
| 2007 | 12.4091 |
| 2006 | 12.2863 |
| 2005 | 12.1709 |
| 2004 | 12.0747 |
| 2003 | 12.0006 |
| 2002 | 11.9561 |
| 2001 | 11.9408 |
| 2000 | 11.9546 |
| 1999 | 12.006 |
| 1998 | 12.0793 |
| 1997 | 12.1536 |
| 1996 | 12.234 |
| 1995 | 12.3128 |
| 1994 | 12.3582 |
| 1993 | 12.3675 |
| 1992 | 12.3384 |
| 1991 | 12.2677 |
| 1990 | 12.1766 |
| 1989 | 12.081 |
| 1988 | 11.9937 |
| 1987 | 11.9327 |
| 1986 | 11.9011 |
| 1985 | 11.8919 |
| 1984 | 11.9066 |
| 1983 | 11.9455 |
| 1982 | 12.0083 |
| 1981 | 12.0903 |
| 1980 | 12.1808 |
| 1979 | 12.2747 |
| 1978 | 12.3609 |
| 1977 | 12.4221 |
| 1976 | 12.4573 |
| 1975 | 12.4758 |
| 1974 | 12.4767 |
| 1973 | 12.4601 |
| 1972 | 12.433 |
| 1971 | 12.3987 |
| 1970 | 12.3627 |
| 1969 | 12.3286 |
| 1968 | 12.2962 |
| 1967 | 12.2682 |
| 1966 | 12.2393 |
| 1965 | 12.2018 |
| 1964 | 12.1265 |
| 1963 | 12.0464 |
| 1962 | 12.097 |
| 1961 | 12.2975 |
| 1960 | 12.5675 |