| 年份 | 尼日尔 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 0.8301 |
| 2020 | 0.208664 |
| 2019 | 0.0887703 |
| 2018 | 0.422039 |
| 2017 | 0.0744665 |
| 2016 | 0.0989601 |
| 2015 | 0.100901 |
| 2014 | 0.0719465 |
| 2013 | 0.146524 |
| 2012 | 0.343743 |
| 2011 | 0.453708 |
| 2010 | 0.308154 |
| 2009 | 0.259601 |
| 2008 | 0.259877 |
| 2007 | 0.373376 |
| 2006 | 0.299795 |
| 2005 | 0.220849 |
| 2004 | 0.0229428 |
| 2003 | 0.00116371 |
| 2002 | 0.00261251 |
| 2001 | 0.00247606 |
| 2000 | 0.00228394 |
| 1999 | 0.00103001 |
| 1998 | 0.0658848 |
| 1997 | 0.0954042 |
| 1996 | - |
| 1995 | 0.00607398 |
| 1994 | - |
| 1993 | - |
| 1992 | - |
| 1991 | - |
| 1990 | - |
| 1989 | - |
| 1988 | - |
| 1987 | - |
| 1986 | - |
| 1985 | 0.020469 |
| 1984 | 0.121563 |
| 1983 | 0.022804 |
| 1982 | 0.0183773 |
| 1981 | 0.0219322 |
| 1980 | 0.0294505 |
| 1979 | 0.0327746 |
| 1978 | 0.0294454 |
| 1977 | 0.0326853 |
| 1976 | 0.0140475 |
| 1975 | 0.00820325 |
| 1974 | 0.0269661 |
| 1973 | 0.00377189 |
| 1972 | - |
| 1971 | - |
| 1970 | 0.00511415 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |