| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | 2.75568 |
| 2019 | 3.18661 |
| 2018 | 2.49356 |
| 2017 | 2.37649 |
| 2016 | 2.44396 |
| 2015 | 2.08095 |
| 2014 | - |
| 2013 | - |
| 2012 | 0.86918 |
| 2011 | 0.82816 |
| 2010 | 0.78188 |
| 2009 | 0.73307 |
| 2008 | 0.61687 |
| 2007 | 0.51873 |
| 2006 | 0.5125 |
| 2005 | 0.56357 |
| 2004 | 0.43784 |
| 2003 | 0.45178 |
| 2002 | - |
| 2001 | - |
| 2000 | - |
| 1999 | - |
| 1998 | - |
| 1997 | - |
| 1996 | - |
| 1995 | - |
| 1994 | - |
| 1993 | - |
| 1992 | - |
| 1991 | - |
| 1990 | 0.18942 |
| 1989 | 0.17689 |
| 1988 | - |
| 1987 | 0.17858 |
| 1986 | - |
| 1985 | 0.16796 |
| 1984 | 0.1725 |
| 1983 | 0.11426 |
| 1982 | 0.11265 |
| 1981 | 0.10167 |
| 1980 | 0.05878 |
| 1979 | 0.06022 |
| 1978 | 0.04685 |
| 1977 | 0.04425 |
| 1976 | 0.02323 |
| 1975 | 0.01626 |
| 1974 | 0.00533 |
| 1973 | 0.00504 |
| 1972 | - |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |