| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 4.93082 |
| 2021 | 4.97032 |
| 2020 | 5.0099 |
| 2019 | 5.01545 |
| 2018 | 4.98754 |
| 2017 | 4.95824 |
| 2016 | 4.92919 |
| 2015 | 4.90219 |
| 2014 | 4.91983 |
| 2013 | 4.97025 |
| 2012 | 4.9844 |
| 2011 | 4.96054 |
| 2010 | 4.91266 |
| 2009 | 4.85349 |
| 2008 | 4.79066 |
| 2007 | 4.72907 |
| 2006 | 4.67172 |
| 2005 | 4.61891 |
| 2004 | 4.56974 |
| 2003 | 4.52688 |
| 2002 | 4.49125 |
| 2001 | 4.45932 |
| 2000 | 4.42953 |
| 1999 | 4.40104 |
| 1998 | 4.3724 |
| 1997 | 4.34311 |
| 1996 | 4.31645 |
| 1995 | 4.29483 |
| 1994 | 4.27486 |
| 1993 | 4.25462 |
| 1992 | 4.23412 |
| 1991 | 4.21067 |
| 1990 | 4.18162 |
| 1989 | 4.14827 |
| 1988 | 4.11133 |
| 1987 | 4.07032 |
| 1986 | 4.02766 |
| 1985 | 3.98325 |
| 1984 | 3.93498 |
| 1983 | 3.88121 |
| 1982 | 3.82365 |
| 1981 | 3.7646 |
| 1980 | 3.70518 |
| 1979 | 3.6461 |
| 1978 | 3.58757 |
| 1977 | 3.53115 |
| 1976 | 3.47723 |
| 1975 | 3.42328 |
| 1974 | 3.37023 |
| 1973 | 3.32002 |
| 1972 | 3.27046 |
| 1971 | 3.22026 |
| 1970 | 3.16612 |
| 1969 | 3.10616 |
| 1968 | 3.04161 |
| 1967 | 2.97194 |
| 1966 | 2.89479 |
| 1965 | 2.80963 |
| 1964 | 2.70635 |
| 1963 | 2.58867 |
| 1962 | 2.47283 |
| 1961 | 2.35863 |
| 1960 | 2.24384 |