| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | 4.10143 |
| 2021 | 3.82176 |
| 2020 | 3.8192 |
| 2019 | 3.52623 |
| 2018 | 3.45728 |
| 2017 | 2.57818 |
| 2016 | 2.95843 |
| 2015 | 4.48669 |
| 2014 | 5.10368 |
| 2013 | 3.68953 |
| 2012 | 3.18682 |
| 2011 | 3.07762 |
| 2010 | 2.72195 |
| 2009 | 3.33588 |
| 2008 | 2.72312 |
| 2007 | 3.01462 |
| 2006 | 2.55852 |
| 2005 | - |
| 2004 | - |
| 2003 | 1.93706 |
| 2002 | 2.40134 |
| 2001 | 2.27982 |
| 2000 | 2.56502 |
| 1999 | 2.56853 |
| 1998 | - |
| 1997 | - |
| 1996 | 2.14418 |
| 1995 | 2.32975 |
| 1994 | 2.26539 |
| 1993 | 2.06512 |
| 1992 | 2.24298 |
| 1991 | 2.30833 |
| 1990 | 2.07437 |
| 1989 | - |
| 1988 | - |
| 1987 | - |
| 1986 | - |
| 1985 | - |
| 1984 | - |
| 1983 | - |
| 1982 | - |
| 1981 | - |
| 1980 | - |
| 1979 | - |
| 1978 | - |
| 1977 | - |
| 1976 | - |
| 1975 | - |
| 1974 | - |
| 1973 | - |
| 1972 | - |
| 1971 | 1.05227 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |